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土壤交换性钾的含量,常作为土壤钾素供应的指标,因此,交换性钾的测定便成为化验室经常分析的重要项目之一。土壤交换性钾含量较低,通常仅为全钾量的1—2％,虽然应用火焰光度法测定是一个简便而快速的方法,但因限于设备条件而难以推广应用。我室过去一贯沿用亚硝酸钴钠容量法,此法手续冗长,干扰较多,沉淀条件要求苛刻,难以满足科研和生产要求。1974年做了
Soil exchangeable potassium content, often as an indicator of soil potassium supply, therefore, the determination of exchangeable potassium has become one of the important laboratory routine analysis. Soil exchangeable potassium content is low, usually only 1-2% of the total potassium content, although the use of flame photometry is a simple and rapid method, but due to equipment limitations and difficult to promote the application. My room used to be consistent with the cobaltous acid sodium nitrite volume method, this method is lengthy, more interference, precipitation conditions demanding, it is difficult to meet the scientific research and production requirements. Made in 1974