土壤六价铬分析的样品前处理消解法.pdf

GB5085.3—200

T
Solidwastes–SamplePreparationforAnalyzeofCr
–AlkalineDegestion

1

pH
ORPTOCCODBODCr(VI)
Cr(VI)

2

Na2CO3/NaOHCr(VI)
Cr(III)Mg2+

3

3.1HNO35.0mol/L20-25
-
NO3NO2Cr(VI)

3.2Na2CO320-25

3.3NaOH20-25

2+
3.4MgCl2400mgMgCl2100mgMg20-25

3.5

3.5.1K2HPO4

3.5.2KH2PO4

3.5.30.5mol/LK2HPO4/0.5mol/LKH2PO4pH=787.09gK2HPO468.04gKH2PO4700ml
1L

3.6PbCrO410-20mgPbCrO420-25

3.720.00.05gNaOH30.00.05gNa2CO31L20-25
pH11.5

3.8K2Cr2O71000mg/LCr(VI)2.829g105K2Cr2O7
1L1000mg/LCr(VI)20-25
170
6

3.9100mg/LCr(VI)10ml1000mg/LK2Cr2O73.8100ml

3.10Cr(VI)

4

4.1250ml

4.2100ml

4.31000ml100ml

4.4

4.50.45m

4.690-95

4.7

4.8pH

4.9

4.10NIST100

5

5.14±2

5.230168

5.3C
Cr(VI)Cr(III)

6

6.150ml250ml
90-95

6.22.50.10g250ml

6.3501ml400mgMgCl20.5ml1.0mol/L

171
GB5085.3—200
6.45

6.590-9560

6.6
30.45m250ml

6.75.0mol/LpH
7.5±0.5pH
0.45m

CO2

6.8100ml

7

7.1

ADE
BC
Ag/mlBgC%/100D
Eml

7.2

(SD)
RPD
[(SD)/2]
RPDSD

7.3

SSR-SR
=*100%
SA

SSRSRSA

8

8.1Cr(VI)
Cr(VI)

8.2LCS

50mlLCS
80%-120%

8.4RPD20

172
8.5201.0ml

40mgCr(VI)/kg10-20mgPbCrO4
75-115%

173