21/30424859 DC
BS EN ISO 10304-4. Water quality. Determination of dissolved anions by liquid chromatography of ions Part 4. Determination of chlorate, chloride and chlorite in water with low contamination
| Označení normy: | 21/30424859 DC |
| Počet stran: | 23 |
| Vydáno: | 2021-01-06 |
| Status: | Draft for Comment |
21/30424859 DC
This standard 21/30424859 DC BS EN ISO 10304-4. Water quality. Determination of dissolved anions by liquid chromatography of ions is classified in these ICS categories:
- 13.060.50 Examination of water for chemical substances
This document specifies a method for the determination of the dissolved anions chlorate, chloride, and chlorite in water with low contamination (e.g. drinking water, raw water or swimming pool water).
An appropriate pretreatment of the sample (e.g. dilution) and the use of a conductivity detector (CD), UV detector (UV) or amperometric detector (AD) make the working ranges given in Table 1 feasible.
| mg/la | ||
|---|---|---|
| Chlorate | 0,03 to 10 | CD |
| Chloride | 0,1 to 50 | CD |
| Chloriteb | 0,05 to 1 | CD |
| 0,1 to 1 | UV; λ=207 nm to 220 nm | |
| 0,01 to 1 | AD; 0,4 to 1,0 V |
The working range is restricted by the ion-exchange capacity of the columns. Dilute the sample in to the working range, if necessary.
The minimum working range for chlorite of 0,05 mg/l was obtained using calibration checks, but the round robin trials (Annex A, Table A.4) showed that it is difficult to obtain this with sufficient accuracy. Thus great care shall be taken when working in the lower range of this method.