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土壤速效钾(水溶性钾及交换性钾之和)的测定,常用1M中性乙酸铵溶液浸提,火焰光度法定量钾.但在没有火焰光度计的条件下,特别是在全国开展土壤普查和诊断工作时,许多县级以下的试验场站需要有简单、快速、可靠的化学测定方法.四苯硼比浊法比较能满足这种需要.Rubia等(1955)最初用四苯硼比浊法测定微量钾时,先在pH5微酸性介质中沉淀四苯硼钾,然后加入pH2缓冲液(以防止金属离子的水解和磷酸盐等的析出),在白光下进行光电比浊.Power等(1956)认
Soil available potassium (soluble potassium and exchangeable potassium and) determination, commonly used 1M neutral ammonium acetate solution leaching, potassium potassium flame photometry.But in the absence of flame photometer conditions, especially in the country to carry out soil census And diagnostic work, many of the test sites below the county level need to have a simple, rapid and reliable method for chemical determination.Typia benzene turbidimetric method to meet this need.Rubia et al (1955) initially with tetraphenyl boron nephelometry Determination of trace potassium method, the first pH5 slightly acidic medium precipitated potassium tetraphenylborate, then add pH2 buffer (in order to prevent the hydrolysis of metal ions and phosphate precipitation, etc.), in white light opacity .Power et al 1956) recognized