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粘质土混浊液加聚丙烯酰胺(PAA)溶液后,出现明显的絮凝现象,溶液变清,用普通方法过滤得待测液.与抽滤法比较结果,K~+、Na~+测值相对偏差<15%,可满足一般土壤分析的要求.经试验,10克土的混浊液中加入0.1～0.5ml 0.5%PPA溶液可不致影响K~+、Na~+测定.标准液中加入PAA液后,测定结果随加入量的增加而降低,故标准液中不应加入PAA絮凝剂.
Clay soil turbidity plus polyacrylamide (PAA) solution, the obvious flocculation phenomenon, the solution becomes clear, with the ordinary method of filtration to be measured solution.Compared with the suction filtration results, K ~ +, Na ~ + measurement The relative deviation <15%, can meet the requirements of general soil analysis.After the test, adding 0.1 ~ 0.5ml 0.5% PPA solution into the turbidity of 10 grams of soil can not affect the determination of K ~ +, Na ~ + standards PAA After the liquid, the measurement result decreases with the increase of the added amount, so PAA flocculant should not be added to the standard solution.