本法基于用P-204/甲苯萃取分离后,用甲醛肟比色。用优选法选择了最佳条件,得知萃取的pH以4.2～4.7为最好,样品中锰的回收率为98%以上。因此绘制标准曲线时,锰的标准溶液可不经萃取而直接加甲醛肟反萃取液即可。一、主要试剂: P-204的甲苯溶液米:于250毫升分液漏斗中,加40毫升P-204和160毫升甲苯,混匀,加30毫升1N盐酸洗振30秒钟,弃去水相,再加30毫升1N盐酸重洗1次。加20 This method is based on the formaldehyde oxime colorimetric method after extraction with P-204 / toluene extraction. The optimal conditions were selected by the optimization method, and the pH value of the extraction was 4.2-4.7, the recovery rate of manganese in the sample was more than 98%. Therefore, when drawing the standard curve, the standard solution of manganese can be directly added formaldehyde oxime stripping solution without extraction. First, the main reagent: P-204 solution of toluene: In 250 ml separatory funnel, add 40 ml of P-204 and 160 ml of toluene, mix, add 30 ml of 1N hydrochloric acid to shake for 30 seconds, discard the aqueous phase , Plus 30 ml of 1N hydrochloric acid to re-wash once. Plus 20