烟田土壤中有效硼的测定

提出了一种测定烟田土壤中有效硼的改进方法。该法用普通的聚乙烯瓶代替昂贵的石英三角瓶和石英回流器 ,在沸水中提取土壤中的有效硼 ,用等离子体原子发射光谱法代替姜黄素比色法测定提取物中的有效硼含量。方法的检出限为 0 .0 0 87mg/kg ,相对标准偏差为 6.5 5 %。采用该法对国家土壤有效态一级标准物质GBW0 74 12和GBW0 74 14中的硼进行了测定 ,测定结果与标准值接近 ,并采用该法测定了 2 0个土壤样品中的有效硼

An Improved Method for Determining Available Boron in Soil

An improved method for determining available boron in soil of tobacco field was developed, in which soil samples were put into water contained in a common polyethylene bottle, instead of quartz flask and reflux condenser, available boron in soil was extracted in boiling water bath. The boron in the extract was analyzed with inductively coupled plasma emission spectrometry, a substitutional method for curcumine colorimetry. The limit of detection of this method was about 0.0087mg/kg and its relative standard deviation was 6.55%. The contents of boron in two national standard materials, GBW07412 and GBW07414, were determined with the method and the obtained values were close with the standard values. The contents of available boron in 20 soil samples were also determined with the method.