Based on the reaction between crystal violet and sodium dodecyl sulfonate in a buffer solution with a pH of 7.00,a rapid test paper for sodium dodecyl sulfonate is developed to determine whether wastewater contains anionic surfactants or not.The results show that the color will be more pronounced when the test paper dipped with 1 mg·L-1 crystal violet solution is mixed with the buffer solution with a pH of 7.00,under a volume ratio of 3∶1.The concentration of sodium dodecyl sulfonate is proportional to the color rendering depth,and the color of the solution changes from colorless to light rose red to rose red to purple red.The lowest and highest detection values of the sodium dodecyl sulfonate test paper are 0.05 mg·L-1 and 2 mg·L-1,respectively.The relative error ranges from 1.167％to 4.233％for detection results of prepared samples,showing a good accuracy.
sodium dodecyl sulfonatecrystal violetstandard colorimetric carddetection by test paperdipping solution for test paper
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