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determination of phosphate in sewage as the phosphomolybdenum blue complex. They
point out that the disadvantage of aqueous stannous chloride reduction reagent is that it
oxidises rapidly and a fresh solution must be prepared daily. Solutions of stannous
chloride in glycerol were found to be stable for at least six months.
9.8.2
Flow injection analysis
Schulze and Thiele [14] compared results obtained by flow injection analysis and the
standard DIN 38402 method for the determination of orthophosphate.
9.8.3
High performance liquid chromatography
Morgan and Danielson [15] have described the development of an enzymatic method of
determining phosphate eluted from a reverse phase high performance liquid
chromatographic column. The method is applicable to sewage effluents. It is based on the
nucleoside phosphorylase catalysed conversion of inosine and orthophosphate to
hypoxanthine. This method is claimed to give better results than standard molybdenum
blue Spectrophotometric methods.
Fig. 9.2
Flow diagram of analytical system for nitrite nitrogen (Technicon
Industrial Method Sheet No.162-72E) Sulphanilamide reagent 100ml
conc phosphoric acid to 600ml water. Add 10g sulphanalmide then
2g N-(napthylethylene) diamine diluted to IL.
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