Study on the Test Method of Trace Phosphorous in Drinking Water

In order to get an accurate test method of trace phosphorous in drinking water, different test methods of phosphorus were researched. Drew standard curves of these methods, Calculated correlation coefficient of these standard curves for comparison. The result shows that the improved PMA-Malachite Green spectrophotometry was more accurate in the test of trace phosphorus, by using the cuvette with 1cm light path, the correlation coefficient of it's standard curve can reach 0.9995. The improved method is suitable for measuring trace phosphorus in drinking water.