土壤有效硫批量检测方法改进

Improvement of Batch Detection Method for Soil Available Sulfur

土壤有效硫检测的常规方法是利用硫酸钡比浊法,鉴于规范推荐的测试步骤在批量土壤样品测试时效率较低,因此对常规方法进行了改进。加入2.0g氯化钡晶粒改为加入浓度为200g/L氯化钡溶液10mL;加稳固剂阿拉伯胶水溶液4mL改为加入浓度为6%甘油-乙醇(1+2)溶液5mL。通过对比实验,改进后检测方法比常规方法操作简便快捷,省时、省力、数据准确可靠,标准曲线线性相关系数达到0.9982。对土壤有效态成分分析标准物质土样GBW07459(ASA-8)、GBW07460(ASA-9)GBW07461(ASA-10)进行多次平行测试,测试结果全部在标准值范围内,且平行相对相差≤10%,证明改进后的检测方法可用于土壤有效硫的检测。

Barium sulfate turbidimetry is a routine method for soil effective sulphur determination.Due to the inefficiency of recommended analysis method in massive soil samples detection,the conventional methods has been improved.Changing 2.0g of barium chloride grain to 10mL barium chloride solution with the concentration of 200g/L.Changing 4mL stabilizer arabia glue solution to 5mL glycerin-ethyl(1+2)solution with the concentration of 6%.According to comparing experiment results,the improved method is more simple and faster than the conventional method.It can provide an accurate and reliable result.The standard curve obtained is linear with a correlation coefficient of 0.9982.Several parallel tests have been carried out by using standardized soil samples of GBW07459(ASA-8),GBW07460(ASA-9)and GBW07461(ASA-10).The test results are all within the range of standard values.The parallel relative difference is less than 10%.It has verified the liability of the improved method for soils effective sulfur determination.