A colorimetric method for simultaneous determination of hexavalent chromium and lead
A technology for colorimetric determination and hexavalent chromium, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, and can solve the problem that hexavalent chromium and lead cannot be quickly measured on site, etc. problems, to achieve the effects of simplifying the determination method and operation steps, saving reagents, and being easy to popularize and apply
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Embodiment 1
[0021] In this embodiment, the composite color development system selects 0.05mol / L diphenylcarbazide and dithizone with a concentration of 0.025mmol / L and 0.124mol / L sulfamic acid. figure 1 In the technical route shown, R is the composite chromogenic system, S is the water sample, open the No. 2 valve, the peristaltic pump draws the water sample, then open the No. 1 valve, extract the composite chromogenic system, perform spectral detection, and discharge the waste liquid in the waste water. Liquid pool W, see attached for scanning spectrogram figure 2 , with 0~0.5mg / L potassium dichromate and 0~0.1mg / L lead nitrate as the standard solution, establish a standard curve, and measure the hexavalent chromium and lead ion values of the sample.
[0022] The present invention carries out double-wavelength processing to the data of standard solution spectral measurement, establishes standard curve, and the slope of the standard equation of chromium ion and lead ion is respectively...
Embodiment 2
[0032] In the present embodiment, the composite color developing system selects Alizarin Blue S of 0.01mol / L and dithizone with a concentration of 0.025mmol / L, and also has a concentration of 0.124mol / L sulfamic acid, and the water sample is developed according to the above steps. Color detection, with 0.001~0.5mg / L potassium dichromate and 0~0.1mg / L lead nitrate as the standard solution, establish a standard curve, and determine the chromium ion and lead ion value of the sample.
[0033] The present invention carries out dual-wavelength processing to the data of standard solution spectral measurement, establishes standard curve, the slope of the standard equation of hexavalent chromium ion and lead ion is respectively 0.9917, 0.3221, and blank solution measures 5 times to obtain the detection of this method. The limits were 0.008 mg / L and 0.010 mg / L respectively (detection limit = (3×standard deviation of blank) / slope of standard curve).
[0034] In summary, the minimum detec...
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