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1 Tl Thallium CAS CH 3 COOTl Thallium Acetate CAS Tl 2 CO 3 Thallium Carbonate CAS Tl 2 SO 4 Thallium Sulfate CAS TlNO 3 Thallium Nitrate CAS TlClO 3 Thallium Chlorate CAS TlF Thallium Fluoride CAS TlCN Thallium Cyanide CAS TlBr 3 4H 2 O Thallium Bromide CAS Tetrahydrate kpa mg/l LogPow * Tl E-10 (25) 2.65E+4(25) 0.23 CH 3 COOTl (25) 2.8E+4(25) Tl 2 CO (25) 5.2E+4(25) Tl 2 SO E-14 (25) 29.9(25) 1.58 TlNO TlClO TlF TlCN E-12 (25) 9.55E+4(25)

2 kpa mg/l LogPow * TlBr 3 4H 2 O * LDL05714µg/kg TLD mg/kg 100mL ICP 100mL 1M HBr MIBK H(TlBr 4 )MIBK ICP 1000g/mL 1000g/mL 4--2-MIBK TORAYPURE LV-10T

3 1 5 B 2 1% 3 100mL 4 5mL 5070mL 5 5 B 100mL 6 100mL 2mL 7 5 B 15mL MIBK10mL MIBK 10MIBK mL 10mL 12

4 Tl 1000g/mL 5% 1g/mL Bi 1000g/mL 1g/mL Tl Bi 5%0.002ng/mL 10ng/mL 13 5ng/mL 0.002ng/mL 10ng/mL 5 1g/mL 1 ICP-MS ICP-MS SPQ kW 10mm 16L/min 1.0L/min 0.83L/min m/z=203, Bim/z=209 Tl 1g/mL5%Bi ICP-MS Tl Bi Tl ng/ml ng/ml IDL ICP-MS IDL 15 IDL(ng/mL) (ml) (ml) IDL (ng/ml) 203 Tl Tl MDLMQL

5 16 Tl IDL 5 MDLMQL MDLMQL (ml) (ml) (ng/ml) (ng/ml) 203 Tl Tl (ml) (ml) (ng/ml) (ng/ml) 203 Tl Tl PTFE PFA 2 1% 3 100mL 1mL 4 50mL 2.5mL 5 1% 4mL 6 ICP-MS Tl Tl

6 1g/mL 0.5mL 100mL 5ng/mL 7 8 MIBK M 9 MIBK Tl Tl 100% 10 MIBK MIBK ml 11 MIBK 0.5mL 0.5mL 12 1g/mL 0.05mL 10mL 5ng/mL 13 ICP-MS Tl 14 Tl m/z=

7 15 IDL IDL 203 Tl 205 Tl (ml) (ml (ng/ml IDL(ng/mL) IDL(ng/mL) CV(%) IDL=t(n-10.05) σ n-1 2

8 16 MDLMQL MDLMQL 203 Tl 205 Tl (ml) (ng) (ng/ml (ml (ng/ml (ng/ml (ng/mL (ng/mL (ng/mL (ng/mL (ng/mL (ng/mL (ng/mL MDL(ng/mL MQL(ng/mL CV(%) MDL=t(n-10.05) σ n-1 2 MQL=σ n-1 10

9 203 Tl 205 Tl (ml) (ng) (ng/ml (ml (ng/ml (ng/ml (ng/mL (ng/mL (ng/mL (ng/mL (ng/mL (ng/mL (ng/mL MDL(ng/mL MQL(ng/mL CV(%) MDL=t(n-10.05) σ n-1 2 MQL=σ n-1 10

10 1 1 2Bi5ng/mL

11 3Tl 0.013ng/mL 3 3 ) (m/z) (ml) (ng) (ng/ml) (%) (%) ND ND Tl MDL 3 MDL 30

12 4 4 1) 2) (m/z) (ml) (ng) (ng/ml) (%) (%) Tl MDL Tl 5 5Tl (%) (ng/ml) % ng/mL 0.006ng/mL 0.012ng/mL 0.012ng/mL 0.01ng/mL

13 ng/mL ng/ml 1JIS K JIS K TEL FAX Yutaka_Iida@trc.toray.co.jp Takayuki_Ichinose@trc.toray.co.jp

14 Summary Thallium and water-soluble thallium compounds Analytical methods were developed for the determination of thallium and water-soluble thallium compounds in water by inductively coupled plasma mass spectrometry (ICP-MS). Multiple element simultaneousmeasurement (for freshwater sample): A sample was acidified with nitric acid and heated for decomposition of thallium compounds. After cooling and filtration, bismuth was added as an internal standard and thallium in the solution was analyzed by ICP-MS with internal standard correction. The recovery for standard aqueous solutions containing ng/ml of thallium was 101 %. Relative standard deviation was 0.8 %. The quantification limit (MQL) was ng/ml. The recovery of thallium in river water was 103 %. The relative standard deviation was 2.0 %. Single element measurement (for seawater sample): A sample was acidified with nitric acid and heated for decomposition of thallium compounds. After cooling and filtration, bromine water was added, and thallium was extracted with 4-Methyl-2-pentanone (methyl isobutyl ketone :MIBK) as H(TlBr 4 ). The extract was evaporated to dryness and the residue was decomposed with nitric acid and hydrogen peroxide, and thallium was dissolved with nitric acid, and then bismuth was added as an internal standard. Thallium in the solution was analyzed by ICP-MS with internal standard correction. The quantification limit (MQL) was ng/ml. The recovery of thallium in seawater was 107 %The relative standard deviation was 2.7 %. Multiple element simultaneousmeasurement Freshwater Nitric acid 100mL 5mL ICP-MS Single element measurement Heating Constant volume 100mL Filtration IS addition Bi Seawater Nitric acid Heating Filtration 100mL ICP-MS 2mL IS addition Constant volume Bi10mL MIBK decomposition MIBK extraction MIBK 10mL HBr addition 15mL

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