Quantitative detecting method for polyacrylamide in composite/mixture
A quantitative detection method, the technology of polyacrylamide, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of many operation steps, complicated post-processing, and inability to detect polyacrylamide, and achieve the effect of simple operation and good stability
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Embodiment 1
[0026] Marking line drawing for content detection of polyacrylamide-containing controlled-release agent in built-in net-type controlled-release urea
[0027] Weigh the prepared controlled-release agent samples according to Table 1 into 25 mL colorimetric tubes, add about 10 mL of water and ultrasonically disperse, add 1 mL of 5 mol / L acetic acid, and then add 5 mL of 1.31 g / L sodium hypochlorite solution, shake After uniformity, the reaction was continued for 30 min, and then 1 mL of 8 mol / L sodium hydroxide solution was added respectively. After constant volume, shake well and filter, measure the absorbance A1 of the filtrate at 292 nm, and subtract For the absorbance values of other samples, the absorbance value change A2 caused by the consumption of sodium hypochlorite is obtained, and the results are shown in Table 1. The linear regression equation is: y=51.315X-0.8331 (R 2 =0.9908). markings such as figure 1 shown.
[0028] Table 1
[0029] serial nu...
Embodiment 2
[0031] Content detection of polyacrylamide-containing controlled-release agent in built-in net-type controlled-release urea
[0032] Weigh a certain amount of the tested built-in net-type controlled-release urea sample into a 25 mL colorimetric tube, add about 10 mL of water and ultrasonically disperse, add 1 mL of sodium hypochlorite solution with an available chlorine content of 5%, shake well and react for 10 min ( Remove the influence of urea on the concentration of sodium hypochlorite), shake to a constant volume, take 5 mL of the dispersion and filter to measure the absorbance value A1, then add 1 mL of 5 mol / L acetic acid to the colorimetric tube, shake it up and continue to react for 30 min, then add 1 mL of 8 mol / L sodium hydroxide solution, constant volume, shake well and filter, measure the absorbance A2 of the filtrate at 292 nm, and calculate the change in absorbance A=A1 caused by the consumption of sodium hypochlorite by the controlled-release agent in the bu...
Embodiment 3
[0034] Content detection of polyacrylamide-containing controlled-release agent in built-in net-type controlled-release compound fertilizer
[0035] Weigh a certain amount of the tested built-in net-type controlled-release compound fertilizer sample into a 25 mL colorimetric tube, add about 10 mL of water and ultrasonically disperse, then add 1 mL of 4 mol / L sulfuric acid and ultrasonically (remove the effect of clay in the compound fertilizer on sodium hypochlorite Concentration), filter (to remove most of the influence of urea and ammonium on the concentration of sodium hypochlorite), rinse with water several times, collect the filter residue in a 25 mL colorimetric tube, add 0.5 mL of 8 mol / L sodium hydroxide solution and shake well Add 1 mL of 1.31 g / L sodium hypochlorite solution, shake well and react for 10 min (remove possible residual urea and ammonium). After constant volume and shake well, take 5 mL of dispersion and filter to measure absorbance A1, then add 5 ...
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