Leaching Assessments of Toxic Metals in
Waste Plasma Display Panel Glass
Mengjun Chena, b, Pengfei Jianga, Haiyan Chena, Oladele A. Ogunseitanb, Yungui Lia
a
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of
Education, Southwest University of Science and Technology, 59 Qinglong Road,
Mianyang, 621010, China
b
Program in Public Health and School of Social Ecology, University of California,
Irvine, CA 92697, USA
*Author for correspondence. E-mail: kyling.chen@gmail.com
Contents
Four tables and one figure are included in this supporting information
TABLE A. Toxicity characteristic leaching procedure of USA and China
TABLE B. Distribution patterns of metals among the different fractions for each
sequential extraction scheme (mg/kg)
1
TABLE C. TCLP extracted concentrations for waste PDP back glass and residues
after extracting fraction 1, 2 and 3 by BCR, Tessier and Grimalt
sequential extraction method.
TABLE D.
EDTA and DTPA extractable metals in waste PDP glass (mg/kg)
Figure A Schematic illustration of single cell/pixel in PDP TV. A PDP composes of
two sealed glass plates (front glass and back glass). The space between
two-glass plates is filled with a Ne and Xe gas mixture. When a voltage
pulse passes between two electrodes, the gas breaks down and produces
weakly ionized plasma, which emits UV radiation. The UV radiation
activates color phosphors and visible light is emitted from each pixel.
2
TABLE A. Toxicity characteristic leaching procedure of USA and China
Leachant
USA
# 1: Add 5.7 mL glacial CH3COOH to 500 mL of reagent water, add 64.3 mL of 1N NaOH, and dilute to a volume of 1 liter, pH =
L/S ratio (ml/mg) Time and temperature
20
18 ± 2 h at
23 ± 2 oC
4.93 ± 0.05; # 2: Dilute 5.7 mL glacial CH3CH2OOH with reagent water to a volume of 1 liter, and the pH of this fluid will be
2.88 + 0.05.
China
Dilute a mix acid of H2SO4 and HNO3 with reagent water to a volume of 1 liter, pH of this fluid should be 3.20 ± 0.05 and the
ratio of H2SO4 and HNO3 is m(H2SO4)/m(HNO3)=2/1.
10
18 ± 2 h at
23 ± 2 oC
3
TABLE B. Distribution patterns of metals among the different fractions for each sequential extraction scheme (mg/kg, waste PDP back glass)
BCR
Tessier
Grimalt
Metal
Zn
Cu
Ag
Ba
As
Fraction 1
59161.0± 273
10.39± 0.43
1.50± 0.02
9.87± 0.05
0.72± 0.02
Fraction 2
12738.6± 58.9
12.16± 0.51
70.30± 1.12
670.81± 3.14
1.17± 0.02
Fraction 3
3945.87± 18.3
7.46± 0.31
25.70± 0.41
570.11± 2.67
1.70± 0.04
Fraction 4
1289.64± 5.96
29.52± 1.21
9882.50± 157
115716± 542
144.97± 4.31
Fraction 1
10866.0± 52.1
4.48± 0.20
4.20± 0.06
163.28± 0.75
0.93± 0.03
Fraction 2
62622.5± 300
31.75± 1.44
989.10± 18.4
3274.96± 15.0
0.56± 0.02
Fraction 3
295.82± 1.42
1.67± 0.08
331.50± 6.16
184.60± 0.84
1.81± 0.05
Fraction 4
1431.35± 6.87
22.76± 1.04
8085.50± 150
120231± 550
147.46± 4.35
Fraction 1
15855.6± 92.7
5.64± 0.38
4.20± 0.08
217.59± 1.31
0.77± 0.02
Fraction 2
25595.3± 150
14.55± 0.98
14.70± 0.28
154.62± 0.93
0.33± 0.01
Fraction 3
1618.57± 9.47
3.87± 0.26
351.50± 671
505.34± 3.04
0.60± 0.02
Fraction 4
1025.83± 6.02
29.10± 1.95
8085.50± 154
111831± 673
148.74± 4.27
4
TABLE C. TCLP extracted concentrations for waste PDP back glass and residues after extracting fraction 1, 2 and 3 by BCR, Tessier and Grimalt
sequential extraction method.
BCR
Tessier
Zn
Cu
Ag
PDP
103±5.3
0.42±0.02
After fraction 1
32.7±2.4
0.26±0.02
After fraction 2
6.05±0.05
After fraction 3
0.11±0.01
Ba
Grimalt
As
Zn
Cu
Ag
ND 6.12±0.21
4.46±0.22
103±5.3
0.42±0.02
ND 5.39±0.18
4.77±0.23
78.4±3.2
0.35±0.02
0.18±0.01
ND 2.73±0.11
4.89±0.25
0.91±0.03
0.04±0.01
ND 1.47±0.07
4.76±0.18
0.03±0.01
Ba
As
Zn
Cu
Ag
Ba
As
ND 6.12±0.21
4.46±0.22
103±5.3
0.42±0.02
ND 6.12±0.21
4.46±0.22
ND 24.16±1.2
6.02±0.32
78.4±3.2
0.26±0.02
ND 23.5±1.1
4.30±0.21
0.08±0.01
ND 1.66±0.12
3.87±0.15
1.66±0.06
0.06±0.01
ND 1.59±0.13
5.65±0.27
0.02±0.01
ND 0.19±0.01
4.45±0.23
3.14±0.07
0.03±0.01
ND 2.05±0.17
5.24±0.24
ND: not detected
5
TABLE D. EDTA and DTPA extractable metals in waste PDP back glass (mg/kg)
Zn
Cu
Ag
Ba
As
EDTA
851.05±24.6
4.07±0.170
0.08±0.01
216.09±6.81
44.96±1.25
DTPA
156.02±3.81
2.90±0.130
0.10±0.01
35.71±0.740
31.89±0.950
Total
78014±390
55.92±2.79
11078±154
121091±605
135.92±5.79
6
Figure A
Visible light
Front
glass
Front glass plate
Bus electrode
Sustain electrode (ITO)
MgO layer
Plasma
discharge
Barrier
ribs
Back
glass
Phosphors (R, G, B)
Dielectric layer
Address electrode
Rear glass plate
7