Anions in wastewaters - Determination of Anions in Natural and Treated Waters - page 531

8.3.2 Spectrophotometric method
Greenberg et al. [13] and Williams [14], recommend a method for the determination of
chloride in waste waters in the ranges 0.5mg L −1 [13] and 0-500mg L −1 based on
reaction of chloride with mercuric thiocyanate to form the sparingly ionised mercuric
chloride complex. An equivalent amount of thiocyanate is released which with the
addition of iron(III) forms a red coloured ferricthiocyanate complex which is evaluated
spectrophotometrically.
8.3.3 Flow injection analysis
Van Staden [15] monitored chloride levels in waste waters using flow injection analysis
coupled to a double membrane analyser.
8.3.4 Ion selective electrode
An ion selective electrode determination of chloride in wastewater from the leather
industry (~10.000mg L −1 ) was described by Chen [16]. This method had a recovery of
99% and a detection limit of 5mg L −1 .
8.3.5 Ion chromatography
The application of this technique is discussed under multianion analysis in sections 12.7.1
and 12.7.2.
8.3.6 Ion exclusion chromatography
The application of this technique is discussed under multianion analysis in section
13.2.2.1.
8.4 Chlorite
8.4.1 Spectrophotometric method
The application of this technique is discussed under multianion analysis in section
14.2.3.1.
8.5 Carbonate
8.5.1 Ion exclusion chromatography
The application of this technique is discussed under multianion analysis in section
13.2.2.1.