Onderzoek naar en het operationeel maken van een ionchromatografische methode voor de gehaltebepaling van chloraat en chloriet in drinkwater
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Type
Report
Language
nl
Date
1990-12-31
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Journal Issue
Title
Onderzoek naar en het operationeel maken van een
ionchromatografische methode voor de gehaltebepaling van chloraat en
chloriet in drinkwater
Translated Title
Investigation and operationalisation of an
ionchromatographic method to determine the amount of chlorate and chlorite
in drinking water
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Abstract
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Ion-chromatographic (IC) methods were investigated to determine chlorate and chlorite in drinking water with a lower detection limit (LDL) of 0.01 mg/L. The IC method with the Dionex AS-3 column separated insufficiently 0.050 mg/L Cl0-3 (0.100 mg/L Cl0-2) from 0.33 mg/L NO-3 (0.100 mg/L Cl-) to achieve the LDL, even after modification. The Dionex Ionpac AS-9 column separated 0.050 mg/L Cl0-3 (0.100 mg/L Cl0-2) and 50.0 mg/L NO-3 (150 mg/L Cl-) sufficiently to determine a LDL of 0.007 mg/L Cl0-3 and 0.004 mg/L Cl0-2. Chlorine (0.50 mg/L) and anions normally present in drinking water did not interfere. Chlorite in drinking water must be determined as soon as possible after sampling. A method different from IC has to be developed for the confirmation of the identity and the concentrations of chlorate and chlorite measured. Concentrations of 0.0070 - 0.041 mg/L Cl0-3 and 0.0021 - 0.064 mg/L Cl0-2 were measured in 17 samples of drinking water, and 1.10 g/L Cl0-3 was found in the sodiumhypochlorite solution used for the chlorine interference study.
Ion-chromatographic (IC) methods were investigated to determine chlorate and chlorite in drinking water with a lower detection limit (LDL) of 0.01 mg/L. The IC method with the Dionex AS-3 column separated insufficiently 0.050 mg/L Cl0-3 (0.100 mg/L Cl0-2) from 0.33 mg/L NO-3 (0.100 mg/L Cl-) to achieve the LDL, even after modification. The Dionex Ionpac AS-9 column separated 0.050 mg/L Cl0-3 (0.100 mg/L Cl0-2) and 50.0 mg/L NO-3 (150 mg/L Cl-) sufficiently to determine a LDL of 0.007 mg/L Cl0-3 and 0.004 mg/L Cl0-2. Chlorine (0.50 mg/L) and anions normally present in drinking water did not interfere. Chlorite in drinking water must be determined as soon as possible after sampling. A method different from IC has to be developed for the confirmation of the identity and the concentrations of chlorate and chlorite measured. Concentrations of 0.0070 - 0.041 mg/L Cl0-3 and 0.0021 - 0.064 mg/L Cl0-2 were measured in 17 samples of drinking water, and 1.10 g/L Cl0-3 was found in the sodiumhypochlorite solution used for the chlorine interference study.
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DGM/DWB-D