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A simplified, easily performed persulfate digestion method has been developed to process a large number of water samples for routine determination of total dissolved phosphorus. A neutral potassium persulfate solution (5%, w/v, pH ∼6.5) is added to the samples (at 10mg potassium persulfate per mL of sample), which are then digested at 90°C in an oven for 16h. This method does not require pH adjustment...
Acidic persulfate oxidation is one of the most common procedures used to digest dissolved organic phosphorus compounds in water samples for total dissolved phosphorus determination. It has been reported that the rates of phosphoantimonylmolybdenum blue complex formation were significantly reduced in the digested sample matrix. This study revealed that the intermediate products of persulfate oxidation,...
A kinetic spectrophotometric procedure was developed for determination of submicromolar orthophosphate based on the reaction in which orthophosphate serves as a catalyst in the reduction of molybdenum, and the initial rate of molybdenum-blue formation (λ max =780 nm) is proportional to the concentration of orthophosphate in the samples. The detection limit (3×standard deviation of blank, n=8)...
A surfactant-sensitized spectrophotometric method for determination of trace orthophosphate has been developed using anion surfactant (Ultrawet 60L) with molybdate and malachite green in low acidic medium (pH T 1.0). The method detection limit (3×standard deviation of blank, n=10) was 8nM and the calibration curve was linear over a range of 10–400nM (r 2 =0.997). The molar absorptivity...
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