Anions in aqueous precipitation - Determination of Anions in Natural and Treated Waters - page 436

5.1.7.7 Ion chromatography
Various workers [6,7,10,13-15,30,31] have applied this technique to the determination of
sulphate in rain (Table 5.3).
The application of this technique is discussed under multianion analysis in sections
5.1.14.3 and 12.4.1.

Table 5.3 Determination of nitrite in rain water by ion chromatography

Type of water sample Co-determined onions Ref.

Cl, PO 4 , SO 4 Rain [10,30]

Cl, SO 4

Rain [13,14]

Cl, NO 2 , PO 4 , SO 4

Rain [31]

Cl, NO 2 , SO 4 Rain [7]

Cl, F, Br, NO 2 , SO 4 , SO 3 , PO 4 Rain [6]

Cl, Br, F, NO 2 , PO 4 , BrO 3 , SO 4

Rain [15]

Source: Own files

5.1.7.8 High performance liquid chromatography
The application of this technique is discussed under multianion analysis in sections
13.1.3.1 and 13.1.3.2.

5.1.7.9 Gas chromatography
Faigle and Klockow [32] applied gas chromatography to the determination of traces of
nitrate and (sulphate and phosphate) in rainwater. The dissolved salts are freeze-dried and
converted to the corresponding silver salts. These are then converted to n -butyl esters
with the aid of n -butyl iodide, the n -butyl esters being determined by direct injection into
a gas chromatographic column. Sulphate and phosphate may be determined
simultaneously on a column containing 3%OV-17 on Chromosorb G, while nitrate is
determined separately with 3% tri- p cresylphosphate as the stationary phase on a similar
support.
The application of this technique is also discussed under multianion analysis in section
14.1.2.1.