应用Mehlich3浸提剂提取风沙土中速效磷、速效钾的条件实验  

STUDY ON DETERMINING CONDITIONS OF AVAILABLE P AND K WITH MEHLICH3 REAGENT IN EOLIAN SAND SOIL

作　　者：张志谦[1] 

机构地区：[1]中国科学院兰州沙漠研究所

出　　处：《中国沙漠》1994年第2期78-83,共6页Journal of Desert Research

摘　　要：应用正交实验法研究了Ｍｅｈｌｉｃｈ３试剂测定风沙土中速效磷、速效钾的适宜条件，并以Ｏｌｓｏｎ法（测磷）、ＮＨ＿４ＯＡＣ法（测钾）为标准对所确定的条件进行了检验，结果表明：浸提剂：沙样为１０：１，浸提温度为常温，震荡时间为５ｍｉｎ适宜于待测容液的提取。用钼锑法测定待测溶液中的磷，适宜的显色酸度为０．５５ｍｏｌ／Ｌ１／２Ｈ＿２ＳＯ＿４条件下测定结果与参比法测定结果显著相关；且精密度高、提取量多，是一种适宜风沙土测定的通用浸提剂。This paper studied the appropriate conditions of determining available P and K withmehlich3 reagent by orthogonal design experiment method in eolian sand soil and tested determinativecondition by Olsen method(determine P) nd NH_4OAC method (determine K ) respectively. Resultsshowed that appropriate condition of extracting solution used for measuring available P and K was thatextractent:soil ratio was 10 :1,working temperature 25℃ and shake time 5 min,It was 0.55mol/L 1/2 H_2SO_4 that reached an appropriate discharge- color acidity of determining P byMolybdophosphoric Blue Color method in solution.Under these conditions the determined results withMehlich 3 method were not only remarkably related to contrast method, but also had a higherprecision,more extract and more extensive applicable range. Therefore, Mehlich3 extractent is anuniversal extractent of determining available P and K of eolian sand soil,

关 键 词：Mehlich3试剂 风沙土 磷 钾 实验 

分 类 号：P641.112[天文地球—地质矿产勘探]