Udk159 automatic Kjeldahl analyzer in the determination of dry soil nitrogen
Received:March 04, 2014  Revised:March 04, 2014
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KeyWord:Automatic Kjeldahl apparatus; soils; methods improved; Arid Zone
        
AuthorInstitution
wanglei 新疆师范大学地理科学与旅游学院
Li YanHong 新疆师范大学地理科学与旅游学院
Yuan Jie 新疆师范大学地理科学与旅游学院
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Abstract:
      This study uses a UDK159 automatic Kjeldahl apparatus arid soil total nitrogen methods as well as the uncertainty of test portion. The results showed that: precision tests RSD 0.01919% ~ 0.1073% in between, with a standard substance ammonium sulfate recovery test, the recovery rate of 99.5%, the detection accuracy and precision are in line with national standards; digestion time the choice of coefficient of variation was 0.0088, indicating that the organic matter in soil at 30 min was completely digested; while on the amount of sulfuric acid at10~15mL when the optimal value.
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