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Test method for determination of phosphorus content laundry detergent formulation
by：Meibao
2020-10-18
Test method for determination of phosphorus content laundry detergent formulation (
1)
Take 1 sample digestion: accurate said.
500 g commercial detergent samples, 10 ml perchloric acid digestion, then heating in 10 ml of hydrogen peroxide to top up, be repeated until the samples thoroughly with a white solid, deionized water dissolved, the capacity to 250 ml.
（
2)
Phosphorus molybdenum blue color test solution: precise quantitative standards or move will take to test solution in 25 ml colorimetric tube, to participate in a moderate amount of ammonium molybdate -
Dilute sulfuric acid solution, a moderate amount of reducing agent, to near scale, shake well, boiling water bath heating will time out after cooling, deionized water diluted to scale.
（
3)
Phosphorus standard solution and sample determination: laundry detergent sample solution are conducted in the optimization of experimental conditions of phosphorus molybdenum blue color, with ammonium molybdate -
Sulfuric acid solution as the blank reference, choose 1 cm color dish in the determination of maximum absorption wavelength of 630 nm absorbance.
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