NSF/ANSI 42 – 2007e
© 2007 NSF
This document is part of the NSF International standard development process. This document is subject to
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NSF/ANSI Standard
for Drinking Water Treatment Units –
Drinking water treatment units –
Aesthetic effects
3
Definitions to be added to NSF/ANSI 330
3.1
Reporting Limit: “The “Reporting Limit” (RL) for an analyte is the maximum level, for an
undiluted sample, to which a laboratory may report a particular analyte as “Not Detected”.” The laboratory
must have validated the particular analytical method to this level following the procedures as established
in the referenced method. The laboratory shall have evaluated its MDL (method detection limit) and LOQ
(limit of Quantitation) in reference to the “RL”. In all cases, the MDL must be less than the RL, and
preferably, the LOQ should also be below the RL. Further, to ensure accurate quantitation, when
preparing its calibration standards, the lowest calibration point should be at or less than the RL.
For extracted techniques (i.e., 625), regarding the concentration of the lowest calibration point, the
laboratory should apply the concentration factor due to sample preparation. For example, if for a typical
sample one liter extracted, and the extract concentrated to 1.0 milliliter, for a factor of 1000, if the RL is
set to 0.2 ug/L, then the lowest calibration point should be at or below 0.2 mg/L.”
4
Materials
4.1
Materials in contact with drinking water
POE drinking water treatment units shall conform to the protocol and criteria in NSF/ANSI 61.
POU drinking water treatment units shall conform to the protocol and criteria in this section. Materials in
contact with drinking water shall not impart levels of extractable contaminants that exceed the Total
Allowable Concentration (TAC) MCC or MDWL values specified in tables 1, 2 and 3 when evaluated and
tested in accordance with 4.2.
At a minimum, metallic products shall be evaluated to the TAC levels in Table 1 and products made from
non-metallic components shall be evaluated to the TAC levels in Tables 2 and 3 when evaluated and
tested in accordance with 4.2.
NOTE – The concentration of active agents or additives used in the drinking water treatment process shall be
evaluated in the product water as specified in 6.10. The concentration of active agents or additives used in the
drinking water treatment process shall not be evaluated during extraction testing.
4.1.1 Complete formulation information on any material not certified as specifically compliant with the
sections of the U. S. Code of Federal Regulations, Title 21, listed in table 3, shall be reviewed to
determine whether the material presents a health effects concern in contact with drinking water and to
assess the material's potential for contributing contaminants to the drinking water.
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NOTE – As a minimum for those materials requiring submission of formulation information, the complete
chemical identity or proportion by weight (in some cases approximate weights or proportions may suffice),
ingredient sources of supply, documentation regarding the health effects concern of each ingredient in the
material, and documentation regarding the suitability of each ingredient for use in potable-water-contact material
shall be provided.
4.1.2 The product shall be tested in accordance with 4.2.3. If the product does not impart a
concentration of an extractable contaminant at a level that exceeds the TAC either the MCC, MDWL, or
advisory concentrations in tables 1, 2, or 3 4, the product shall be deemed to have met the requirements
of 4. If the product does impart a concentration of an extractable contaminant at a level that exceeds the
advisory concentration, but not the MCC or MDWL, the product shall be deemed to have met the
requirements of 4, but the manufacturer shall be notified of the concentration of the extractable
contaminant, and a new product sample(s) shall be immediately retested in accordance with 4.2.3.6. For
the parameters in table 4, the required follow-up analyses shall also be performed after the product has
been exposed according to 4.2.3.6, if they were not performed as part of the initial exposure under
4.2.3.2.
4.1.3 Whole-system extraction testing may be waived if components, when separately tested, meet the
requirements of this Standard and are assembled in a manner that does not introduce any new
components, increase the surface area-to-volume ratio of previously evaluated components, or present
potential concern based on cumulative factors.
4.2
Materials evaluation
4.2.1
Analytical methods
All analyses shall be conducted in accordance with the applicable method(s) referenced in 2.
4.2.2
Exposure water
Systems and components shall be exposed to locally available tap water that has been adjusted to
contain 50 ± 5 mg/L total dissolved solids and 0.5 ± 0.05 mg/L free available chlorine, and to have a pH of
6.75 ± 0.25. Exposure water used to evaluate systems or components shall be 23 ± 2 C (73 ± 3 F). Any
existing concentrations of extraction testing parameters listed in tables 1, 2, and 3 4 found to be present
in the exposure water shall be subtracted from the values obtained in the analysis of the extractant water.
4.2.3
Exposure
4.2.3.1 The system or component(s) of a system shall be installed, flushed, and conditioned in
accordance with the manufacturer's instructions using the exposure water specified in 4.2.2 at an initial
inlet static pressure of 340 kPa (50 psig).
4.2.3.2 The system or component(s) shall be refilled with the exposure water specified in 4.2.2 and
maintained for 24 h at a temperature of 23 ± 2 C (73 ± 3 F). A 2-L water sample shall then be collected
in accordance with 4.2.3.3. The system or component(s) shall be flushed according to the manufacturer’s
instructions, refilled, and maintained for another 24 h at a temperature of 23 ± 2 C (73 ± 3F). A second
2-L water sample shall be collected in accordance with 4.2.3.3. The system or component(s) shall again
be flushed according to the manufacturer’s instructions, refilled, and maintained for a third period of 24 h
at a temperature of 23 ± 2 C (73 ± 3 F). A third 2-L water sample shall be collected in accordance with
4.2.3.3.
4.2.3.3 A minimum sample volume of 2 L shall be collected at each sample point. If the water-holding
volume of the product is greater than 2 L, the entire volume shall be collected in a suitable collection
vessel, and a 2-L subsample obtained from this volume. If the water-holding volume of the product is less
than 2 L, sufficient samples shall be exposed to provide the required 2-L volume of extractant water.
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4.2.3.4 All samples collected shall be composited and analyzed in accordance with 4.2.1.
4.2.3.5 Systems with adsorptive or absorptive media shall be tested with and without the media. Testing
without media shall include removal of the media from the system, as well as removal of any non-media
materials or ingredients that cannot be disassociated from the media or materials that would be released
into the effluent of the system in the absence of the physical barrier provided by the media. An example is
the binder used to produce carbon blocks. Normalization or adjustment for changes in wetted surface
area from the normal configuration shall be taken into account. For instance, carbon block end caps will
have more wetted surface area exposed without the carbon block attached; therefore, an appropriate
adjustment in the end caps included in the exposure shall be made.
4.2.3.6 If the level of an extractable contaminant exceeds an advisory concentration in table 1, 2, or 4,
the 72-h test exposure sequence in 4.2.3.2 shall be repeated three times using a new product sample(s).
The extractant water from the third 24-h exposure of the third 72-h exposure sequence shall be analyzed
to determine whether the concentration of the extractable contaminant has been reduced to a
concentration less than or equal to the advisory concentration.
4.3
Gas chromatography/mass spectroscopy (GC/MS) analysis
4.3.1
General requirements for GC/MS analysis
When determined to be required by a toxicologist following a product-specific formulation review, Semivolatile and Volatile Mass Spectral scans shall be performed on non-metal products or components, and
shall include full-range scans to monitor for non-target compounds.
Testing for Semi-Volatiles (EPA Method 625 and Volatiles EPA Method 524.2) shall be conducted using
the required Target Compounds in Tables 2 and 3 and the laboratory’s reporting limit shall be no greater
than the reporting limits listed in Tables 2 and 3.
Contaminants are considered either as “Target Compounds” (targets) or as “Tentatively Identified
Compounds” (TICs). Target compounds are those analytes for which the analytical system has been
specifically validated for, and for the samples in question specifically calibrated in accordance with the
referenced analytical procedure. Contaminants that have been identified and quantified by comparison to
authentic standards shall be compared to the acceptable exposure concentration as determined in
accordance with NSF/ANSI 61 Annex A and NSF/ANSI 61 Annex B. TICs are identified by comparison of
the spectrum of the unknown to the mass-spectral reference library utilizing “Probability Based Matching”
(as available from instrument manufacturers) as well as interpretation by the GC/MS chemist. The
laboratory shall report the TIC with the best match factor except in the following circumstances.
1. Due to the complex nature of GCMS interpretation and identification, when reviewing the list of
possible matches for any particular TIC peak, the laboratory has the authority to assign the
identification to a compound “hit” with a lower numeric match factor from the library search
algorithm.
2. The laboratory may determine that none of the returned compounds by the automated search
algorithm is a good match for the unknown peak. In this case the compound is reported as a
“Unknown”
3. The laboratory may utilize manual spectral interpretation to identify the peak in question.
The library used during the analysis shall be NIST version 2007 or more current version. For TICs, the
concentration is estimated by comparison of its total ion area response to the total ion area response of
the nearest internal standard. For TIC’s, a response factor of “1” (one) shall be utilized for the purposes of
calculating the TICs estimated concentration.
Note: To ensure clear communication of the potential range in concentration of tentatively identified
compounds, as part of the laboratory report shall be the typical range of response factors from their
524.2 and 625 calibrations (based upon the required compound lists within this standard). Because
reporting this range is to give clearer understanding of the potential range in concentration to the user
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of the TIC concentrations, it is acceptable for the laboratory to determine this range on an annual
basis. An example of an appropriate laboratory statement would be; when performing concentration
estimates for tentatively identified compounds, the laboratory utilizes an estimated response factor of
“1”. In performing methods 524.2 and 625 the typical response factors for calibrated compounds are
0.2 to 2.0 and 0.1 to 1.5 respectfully. Because these factors are applied as a reciprocal, this would
mean an overall potential concentration range for any particular TIC from 0.5 the reported
concentration to about 10 times.
TICs that have been identified and quantified by comparison to a known mass spectrum, or by spectral
interpretation by a qualified chemist, or both shall be compared to the acceptable exposure concentration
as determined in accordance with Annex A and Annex B of NSF/ANSI 61. The concentration threshold for
all TICs and unknowns shall be no greater than 3.0 ppb. Upon toxicological review, TICs may require
verification of identification and quantitation as a target compound. This would necessitate performing the
requisite validation studies utilizing an authentic standard of the compound in question. In addition, the
product manufacturer shall assist the testing laboratory in the identification of an authentic standard for
the compound and an appropriate analytical method, if applicable, so that confirmatory identification and
quantification can be performed.
Contaminants that are detected by GC/MS analysis but are not identified and quantified against a known
mass spectrum or authentic standard shall be evaluated as follows:
a) The laboratory shall report the molecular weight or, if no molecular ion is identifiable by the
GC/MS chemist, a minimum value for the molecular weight (ifor example, if the highest mass ion
for the TIC has an m/z of 143, then report MW >=143).
b) The laboratory shall report chemical class information if this determination is possible.
c) The laboratory shall report the presence of the common halogens chlorine and bromine utilizing
their characteristic “M+2” patterns.
d) The product material formulation(s) shall be reviewed for potential identification of the unknown
contaminant(s) as an ingredient or byproduct;
e) The manufacturer shall be notified and requested to provide supporting information that enables
identification of the unknown contaminant(s);
f) Structure activity relationships (SAR) shall be utilized when sufficient structural identification of
the unknown contaminant(s) can be made; and
g) Alternative methods of analysis that may identify the unknown contaminant(s) shall be
considered, such as classifying the unknown into a chemical class.
Contaminants that can be identified after performing one or more of the above steps shall be compared to
the acceptable exposure concentration as determined in accordance with Annex A and Annex B of
NSF/ANSI 61. In addition, the product manufacturer shall assist the testing laboratory in the identification
of an authentic standard for the compound and an appropriate analytical method, if applicable, so that
confirmatory identification and quantification can be performed when needed.
Contaminants detected by GC/MS analysis for which no identification can be made after performing the
above steps shall not be considered in the determination of product compliance to this Standard. When
unknown contaminants are detected in the extractant water, the testing laboratory shall report the
analytical results to the product manufacturer.
Notes:


The product manufacturers should assist the testing laboratory in a continuing effort to
indentify the unknown contaminant(s) until specific identification is achieved.
Items “B” and “C” above may be automated utilizing software available from NIST available
with their mass-spectral database.
The minimum instrument operation requirements for GC/MS analysis shall be in accordance with USEPA
Method 625 with the addition of the following modifications:
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– The average chromatographic peak area of each internal standard in the calibration curve shall
be determined. The chromatographic peak area of each internal standard in the continuing calibration
shall be greater than 50% and not more than 200% of that average;
– While a continuing calibration check (CCC) is performed, concentrations of 10% of the target
compounds for each analysis (e. g., base/neutral, base/neutral/acid, acid) shall be allowed to fall
outside of the range of 70% to 130% (outlier) of the true value. None of the concentrations shall be
allowed to fall below 50% or above 200% of the true value. If a positive sample analyte result is
identified for any outlier, a second CCC shall be performed. If the second CCC determines the
sample analyte result no longer to be an outlier, the sample shall be reanalyzed. However, if the
second CCC also determines the analyte to be an outlier, a new calibration curve shall be determined
and the sample shall be reanalyzed; and
– If commercially available mass spectral libraries are utilized, a minimum size of 100,000
compounds shall be required.
4.4 Pass Fail Criteria
Contaminants that extract from products when tested in accordance to section 4.2 shall be evaluated
to the TAC levels in Tables 1, 2 and 3. Contaminants that extract from products when tested in
accordance to section 4.2 that are not listed in Tables 1, 2 and 3 shall be evaluated in accordance to
NSF/ANSI 61 Annex B (TAC) concentrations and/or Annex A if the contaminant is not listed in the
Annex B tables.
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Table 1 – Extraction testing parameters (Metals)
Parameter
aluminum
antimony
arsenic
barium
beryllium
cadmium
chromium
copper
lead
manganese
mercury
nickel
selenium
thallium
Total Allowable
Concentration (TAC)
0.5
0.006
0.010
2.0
0.004
0.005
0.1
1.3
0.015
0.3
0.002
0.1
0.05
0.002
Reporting Limit (RL) mg/L
0.100
0.001
0.001
0.100
0.001
0.001
0.010
0.100
0.001
0.010
0.001
0.010
0.001
0.001
6
Reference Method(s)
200.7, 200.8
200.8, 200.9
200.8, 200.9
200.7, 200.8
200.7, 200.8, 200.9
200.8, 200.9
200.7, 200.8, 200.9
200.7, 200.8
200.8, 200.9
200.7, 200.8
200.8, 245.1
200.7, 200.8
200.8, 200.9
200.8, 200.9
NSF/ANSI 42 – 2007e
© 2007 NSF
Table 2 – Extraction testing parameters (Semi-Volatiles)
Analyte
CAS Number
2,4,6-Trichlorophenol
2,4-Dichlorophenol
2,4-Dimethylphenol
2,4-Dinitrophenol
2,6-Di-tert-butyl-4methoxyphenol
2-Chlorophenol
2-Methylnaphthalene
2-Nitrophenol
2-Phenyl-2-propanol
3,3-Dichlorobenzidine
3-and 4-Methylphenol, m&pcresol
4,6-Dinitro-2-methylphenol
4-Chloro-3-methylphenol
4-Nitrophenol
4-tert-Butylphenol or p-tertButylphenol
Acenaphthene
Acenaphthylene
Acetophenone
Anthracene
Benzo(a)anthracene
Benzo(a)pyrene
Benzo(b)fluoranthene
Benzo(g,h,i)perylene
Benzo(k)fluoranthene
Benzothiazole
Bis(2-ethylhexyl)adipate
Bis(2-ethylhexyl)phthalate
88-06-2
120-83-2
105-67-9
51-28-5
489-01-0
Butyl benzyl phthalate
85-68-7
95-57-8
91-57-6
88-75-5
617-94-7
91-94-1
106-44-5
534-52-1
59-50-7
100-02-7
98-54-4
83-32-9
208-96-8
98-86-2
120-12-7
56-55-3
50-32-8
205-99-2
191-24-2
207-08-9
95-16-9
103-23-1
117-81-7
Total Allowable
Concentration (TAC)
5.0
3.0
100.0
3.0
30.0
50.0
0.8
700.0
3.0
200.0
0.2
1.0
400.0
6.0
1000.0
7
Reporting Limit (RL)
Reference Method(s)
1.0
1.0
2.0
1.0
5.0
625
625
625
625
1.0
0.4
1.0
0.6
1.0
1.0
625
625
625
625
625
1.0
1.0
1.0
2.0
625
625
625
0.4
0.4
0.6
0.2
0.4
0.2
0.2
0.6
0.2
3.0
0.5
1.0
1.0
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
NSF/ANSI 42 – 2007e
© 2007 NSF
Table 2 – Extraction testing parameters (Semi-Volatiles)
Analyte
Chrysene
Dibenzo(a,h)anthracene
Diethyl phthalate
Dimethyl phthalate
Di-n-butyl phthalate
Di-n-octyl phthalate
Fluoranthene
Fluorene
Indeno(1,2,3-cd)pyrene
Isophorone
Naphthalene
N-Nitroso-di-n-butylamine
N-Nitrosodi-n-propylamine
N-Nitrosodiphenylamine
o-Cresol or 2-methylphenol
Pentachlorophenol
Phenanthrene
Phenol
Phenyl sulfone
Pyrene
CAS Number
218-01-9
53-70-3
84-66-2
131-11-3
84-74-2
117-84-0
206-44-0
86-73-7
193-39-5
78-59-1
91-20-3
924-16-3
621-64-7
86-30-6
95-48-7
87-86-5
85-01-8
108-95-2
127-63-9
129-00-0
Total Allowable
Concentration (TAC)
6000.0
3.0
700.0
3.0
400.0
100.0
0.1
0.1
70.0
1.0
3.0
2000.0
3.0
8
Reporting Limit (RL)
Reference Method(s)
0.3
0.4
1.0
1.0
2.0
1.1
0.2
0.4
0.2
0.5
0.5
0.7
1.0
0.3
1.0
0.5
0.2
0.5
0.2
0.6
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
625
NSF/ANSI 42 – 2007e
© 2007 NSF
Table 3 – Extraction testing parameters (Volatiles)
Analyte
1,1,1,2-Tetrachloroethane
1,1,1-Trichloroethane
1,1,2,2-Tetrachloroethane
1,1,2-Trichloro-1,2,2trifluoroethane
1,1,2-Trichloroethane
1,1-Dichloroethane
1,1-Dichloroethene
1,1-Dichloropropene
1,2,3-Trichlorobenzene
1,2,3-Trichloropropane
1,2,3-Trimethylbenzene
1,2,4-Trichlorobenzene
1,2,4-Trimethylbenzene
1,2-Dibromo-3chloropropane
1,2-Dibromoethane
1,2-Dichlorobenzene
1,2-Dichloroethane
1,2-Dichloropropane
1,3,5-Trimethylbenzene
1,3-Dichlorobenzene
1,3-Dichloropropane
1,4-Dichlorobenzene
2,2-Dichloropropane
2-Butanone
2-Chloro-1,3-butadiene
2-Chlorotoluene
2-ethyl-1-hexanol
2-Hexanone
4-Chlorotoluene
4-Isopropyltoluene
4-Methyl-2-pentanone
CAS Number
630-20-6
71-55-6
79-34-5
76-13-1
79-00-5
75-34-3
75-35-4
563-58-6
87-61-6
96-18-4
526-73-8
120-82-1
95-63-6
Total Allowable
Concentration (TAC)
10.0
200.0
2.0
Reporting Limit (RL)
Reference Method(s)
0.5
0.5
0.5
524.2
524.2
524.2
0.5
3.0
524.2
3.0
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
3.0
40.0
70.0
96-12-8
0.2
0.2
524.2
106-93-4
95-50-1
107-06-2
78-87-5
108-67-8
541-73-1
142-28-9
106-46-7
590-20-7
78-93-3
126-99-8
95-49-8
104-76-7
591-78-6
106-43-4
99-87-6
108-10-1
0.2
600.0
5.0
5.0
0.2
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
5.0
5.0
0.5
5.0
5.0
0.5
0.5
2.0
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
600.0
75.0
4000.0
50.0
3.0
3.0
7000.0
9
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© 2007 NSF
Table 3 – Extraction testing parameters (Volatiles)
Analyte
Acetone
Acetophenone
Acrylonitrile
Allyl chloride
Benzene
bis(2-Chloroethyl)ether
or
Di-(2-chloroethyl) ether
Bromobenzene
Bromochloromethane
Bromodichloromethane
Bromoform
Bromomethane
Carbon disulfide
Carbon tetrachloride
Chlorobenzene
Chloroethane
Chloroform
Chloromethane
cis-1,2-Dichloroethene
cis-1,3-Dichloropropene
Cyclohexanone
Dibromochloromethane
Dibromomethane
Dichlorodifluoromethane
Diethyl ether
Ethyl acrylate
Ethyl
methacrylate
or
Ethylmethacrylate
Ethylbenzene
Hexachlorobutadiene
Isoprene or 2-Methyl-1,3butadiene
Methyl acrylate
Methyl methacrylate
CAS Number
Total Allowable
Concentration (TAC)
6000.0
200.0
Reporting Limit (RL)
Reference Method(s)
5.0
5.0
5.0
0.6
5.0
0.5
524.2
524.2
524.2 SIM
524.2
524.2
111-44-4
5.0
0.3
524.2
108-86-1
74-97-5
75-27-4
75-25-2
74-83-9
75-15-0
56-23-5
108-90-7
75-00-3
67-66-3
74-87-3
156-59-2
10061-01-5
108-94-1
124-48-1
74-95-3
75-71-8
60-29-7
140-88-5
3.0
90.0
80.0
80.0
10.0
700.0
5.0
100.0
0.5
0.5
0.5
0.5
0.5
5.0
0.5
0.5
0.5
0.5
0.5
0.5
0.5
5.0
0.5
0.5
0.5
2.0
1.0
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
524.2
1.0
524.2
0.5
0.5
524.2
524.2
5.0
524.2
1.0
1.0
524.2
524.2
67-64-1
98-86-2
107-13-1
107-05-1
71-43-2
80.0
70.0
4.0
30000.0
80.0
80.0
3.0
10.0
97-63-2
100-41-4
87-68-3
700.0
78-79-5
96-33-3
80-62-6
3.0
10000.0
10
NSF/ANSI 42 – 2007e
© 2007 NSF
Table 3 – Extraction testing parameters (Volatiles)
Analyte
CAS Number
Methyl tert-butyl ether
Methylene chloride
Naphthalene
n-Butyl acrylate
n-Butylbenzene
n-Propylbenzene
1634-04-4
75-09-2
91-20-3
141-32-2
104-51-8
103-65-1
o-Xylene 2 or 1,2-Xylene
Pentachloroethane
sec-Butylbenzene
Styrene
t-Butyl alcohol or t-butanol
or tert-butanol
tert-Butylbenzene
Tetrachloroethene
Tetrahydrofuran
Toluene
Total Xylenes
trans-1,2-Dichloroethene
trans-1,3-Dichloropropene
Trichloroethene
or
Trichloroethylene
Trichlorofluoromethane
Vinyl chloride
95-47-6
76-01-7
135-98-8
100-42-5
75-65-0
98-06-6
127-18-4
109-99-9
108-88-3
156-60-5
10061-02-6
79-01-6
75-69-4
75-01-4
Total Allowable
Concentration (TAC)
Reporting Limit (RL)
Reference Method(s)
5.0
100.0
10.0
0.5
0.5
0.5
1.0
0.5
524.2
524.2
524.2
524.2
524.2
0.5
524.2
0.5
2.0
0.5
0.5
524.2
524.2
524.2
524.2
10000.0
3.0
100.0
9000.0
524.2
5.0
50.0
1000.0
10000.0
100.0
4.0
0.5
0.5
5.0
0.5
0.5
0.5
0.5
524.2
524.2
524.2
524.2
524.2
524.2
524.2
5.0
0.5
524.2
2000.0
2.0
0.5
0.2
524.2
524.2
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NSF/ANSI 42 – 2007e
© 2007 NSF
Table 3 4 – Materials listed in U. S. Code of Federal Regulations,
Title 21, not requiring formulation review
Sections
172.880
178.3700
172.888
178.3720
172.878
172.884
172.886
178.3710
173.25
173.65
178.3620
Part 184
solvents
Material
petrolatum
synthetic petroleum wax
white mineral oil
odorless white petroleum hydrocarbons
petroleum wax
ion exchange resins – provided that the sub-section stating the composition of
the resin is specified
divinyl benzene copolymer
mineral oil
Direct food substances affirmed as generally recognized as safe – when used in
accordance with any conditions of use specified for the substance.
Solvents that may be considered for solvent bonding without review are limited to
acetone, methyl ethyl ketone, cyclohexanone, and tetrahydrofuran. Mixtures such
as solvent cements shall be evaluated against NSF/ANSI 61 or shall be subject
to formulation review.
NOTE – Solvent bonding is not recommended, as solvents soak into synthetic
materials and leach back out into water at relatively high levels for long periods of
time. In addition, solvents can contaminate the work area and can be adsorbed by
carbon in the work area. Solvents, which have been reprocessed or recycled, shall
not be used.
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NSF/ANSI 42 – 2007e
© 2007 NSF
Table 4 – Non-specific extraction testing parameters
Advisory
concentration
(mg/L)
USEPA
method(s)
phenolics
0.05
420.4
total organic
carbon (TOC)
1.0
415.2
Advisory
concentration
(mg/L)
USEPA
method(s)
50
160.1
No follow-up recommended
351.2
Analysis for specific compound(s) in
material formulations, ammonium analysis,
Base/Neutral scan by GC/MS2 (for nonpolar compounds), LC/MS3 (for target polar
compounds)
Required
parameter
Formulation
dependent
parameter
total dissolved
solids (TDS)
total kjeldahl
nitrogen (TKN)
1The
0.5
Additional testing1
Analysis for specific phenolic compound(s)
in material formulations, Base/Neutral/Acid
scan by GC/MS2
Analysis for specific compound(s) in
material formulations, Base/Neutral/Acid
scan by GC/MS2 (for non-polar
compounds), LC/MS3 (for target polar
compounds)
Additional testing1
additional testing required may include one or more of the analyses.
2
Gas chromatography with mass spectroscopy (GC/MS).
3
Liquid chromatography with mass spectroscopy (LC/MS).
13
NSF/ANSI 42 – 2007e
© 2007 NSF
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