Anions in seawater - Determination of Anions in Natural and Treated Waters - page 399

Fig. 3.15 Interference by chloride in the autoanalyser determination of
phosphate
Source: Reproduced with permission from Elsevier Science [172]

Table 3.14 Dependence of chloride content of wash liquid on chloride content of sample

Chloride content of wash (mg L −1 ) Chloride content of sample (mg L −1 )

0 0-1800

4850 1800-7200

10000 7200-12600

15200 12600-18000

Source: Reproduced with permission from Elsevier Science [172]

related to the chloride concentration of the sample. The chloride content of the wash
solution need not be exactly equal to that of the sample. For chloride contents in the
sample up to 18 000mg L −1 , (ie seawater) the chloride concentration in the wash should
be within ±15% of that in the sample (Table 3.14). The use of saline standards is optional
but the use of saline control solutions is mandatory. Using good equipment, down to
0.02mg L −1 phosphate can be determined by such procedures. For chloride contents
above 18,000mg L −1 the chloride content of the wash should be within ±5% of that in the