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Flow-injection spectrophotometric determination of phosphate using Crystal Violet

✍ Scribed by D.Thorburn Burns; D. Chimpalee; N. Chimpalee; S. Ittipornkul

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
325 KB
Volume
254
Category
Article
ISSN
0003-2670

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✦ Synopsis

Phosphate can be determined spectrophotometrically at 560 nm based on the reaction of 12-molybdophosphate and Crystal Violet using flow-injection analysis. The carrier stream was 0.5% (w/v) poly(viny1 alcohol) solution and the reagent streams were 0.1 M sodium molybdate, 5 x 10m4 M Crystal Violet and 12.5% (v/v) nitric acid. The injection rate was 60 hh'. The calibration graph was linear up to 5.0 pg ml-' phosphate and the relative standard deviation for the determination of 1.0 pg ml-' of phosphate was 0.69% (n = 10). The detection limit was 0.02 pg ml-' phosphate, based on an injection volume of 250 ~1. The system was applied to the determination of phosphate in fertilizer and waste water samples.

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