2种纳氏比色法检测土壤铵态氮的对比

Comparison of Two Kinds of Nessler Colorimetric Method to Detect Soil Ammonium Nitrogen

笔者对2种纳氏试剂比色方法检测土壤铵态氮进行了对比性试验,一种是常规的纳氏试剂比色法（常规法）,一种是改进后的纳氏比色法（速测法）,试验证明了速测法具有检测线性范围宽0~168 mg/kg的优点,整个过程检测时间为25 min,比常规法缩短一半;显色灵敏,显色稳定时间长,可稳定几小时以上;检测结果直接显示土壤中养分含量;操作方便快捷;成品试剂,不需要操作人员自配;检测成本低等优点。便携式速测仪及配套的检测方法满足基层测土配方施肥使用。

Comparative experiments were carried out on two kinds of nessler colorimetric method for soil ammonium nitrogen measuring, one was a conventional nessler colorimetric method （routine method）, another was an improved method of nessler （speed measuring method）. The test showed that the speed measuring method with wide linear ranged for 0-168 mg/kg; the whole process of testing time was 25 min, which was half of routine method; the speed measuring method had a sensitive and stability color, it could be stable for a few hours; the test results could show soil nutrient content directly; the speed measuring method could also be operated convenient, it had no need to be operated by operation staff with finished product reagent. In addition, the speed measuring method had the advantage of cost saving. Portable measuring instrument and matched detection method could meet the basic measuring requirement for soil fertilizer use.