Anions in non saline waters - Determination of Anions in Natural and Treated Waters - page 312

methods, did not interfere with this chromatographic method. Calibration was linear for
1-2000µg L −1 sulphide and at 10µg L −1 the relative standard deviation was 3.7%.
The application of this technique is also discussed under multianion analysis in section
12.2.5.
2.94.8 Ion exclusion chromatography
The application of this technique is discussed under multianion analysis in section
13.2.1.1.
2.94.9 Micelle chromatography
The application of this technique is discussed under multianion analysis in section
13.5.1.1.
2.94.10 Gas chromatography
Radford-Knoery and Cutter [835] determined carbonyl sulphide and hydrogen sulphide
species in non saline waters using specialised collection procedures and gas
chromatography with flame photometric detection uncomplexed species. H 2 Saq, Hs − , S 2−
and particulate metal sulphides were determined. The procedure involved helium
stripping of 300ml sample and liquid nitrogen trapping of the evolved gas followed by
gas chromatography. The detection limit was 0.2p mole L −1 total dissolved sulphide.
Yamamoto and Tsuji [836] describe a variation of head-space gas chromatographic
analysis for determining sulphide in non saline waters. Water samples (10-100µL) were
injected into a chamber containing sulphuric acid and sodium sulphate. The generated
hydrogen sulphide was stripped with nitrogen carrier gas and introduced into a gas
chromatograph with a flame photometric detector. The method is suitable for analysis of
small samples of water without pretreatment, allowing 0.02ppm of hydrogen sulphide in
100µL of water to be measured.
Lech and Bagander [837] determined sulphide in aqueous solutions using gas
chromatography with a flame detector.
2.94.11 Preconcentration
The preconcentration of sulphide in non saline waters is discussed in section 15.1.11.
2.94.12 Miscellaneous
Garber et al. [838] compared various methods for the determination of sulphide in
waters. These included methylene blue spectrophotometric procedures, iodiometric
titration, automated analysis and coulometric procedures.
Zakhayavko et al. [839] compared various methods of determining sulphide in waters.
Various volumetric photometric, spectroscopic and potentiometric methods were
examined. The characteristics of these are tabulated. A potentiometric method having
high selectivity and sensitivity (0.01mg L −1 ) and suitable for the analysis of coloured