摘要
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 2.0 g of barium chloride grain to 10 mL barium chloride solution with the concentration of 200 g/L. Changing 4 mL stabilizer arabia glue solution to 5 mL 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.
引文
[1] Morris R J.Sulphur in world agric [A]//TSI-FAI sympo-sium[C].New Delhi :Sulphur in Indian agric,1988.KS/I:1-14.
[2] 陈克文,作物的硫素营养与土壤肥力[J].土壤通报,1982,13(5):43-49.
[3] 刘婷琳,马名扬,胡耀国,等.弱碱性土有效硫测定影响因素的探讨[J].岩矿测试,2011(2):182-185.
[4] 崔权仁,武文明,竟丽丽,等.土壤酸碱度及施硫量对烤烟全硫含量及经济效益的影响[J].安徽农业科学,2016,44(26):121-123,129.
[5] DD2008-06.土地质量地球化学评估技术要求[S].
[6] LY/T1265-1999.森林土壤有效硫的测定[S].
[7] 杜森,高祥照.土壤分析技术规范[M].北京:中国农业出版社,2006:166-167.
[8] NY/T1121.14-2006中华人民共和国农业行业标准第14部分土壤有效硫的测定[S].
[9] 武晓丽,阎铁城.近代硫酸根离子测定方法比较[J].内蒙古科技与经济,2004(9):87-88.
[10] 张玉珠,陈丽芝,王艳辉,等.土壤有效硫测定时标准曲线绘制方法的研究[J].北方农业学报,2008(6):64-65.
[11] 郑国宏,白英.土壤有效硫测定方法的探讨[J].中国土壤与肥料,2011(6):87-89.
[12] 蔡顺香,颜明娟,杨杰.比浊法测定土壤有效硫的探讨[J].福建分析测试,2003,12(2):1746-1749.
[13] 魏珂萍,战鹰,洪波,等.土壤有效硫测定方法的评价及应用[J].山东农业科学,2005(5):39-41.
[14] 巩细民.土壤有效硫测试方法的研究[D].武汉:华中农业大学,2006:25-27.
[15] 杨诗佳.生活饮用水中硫酸盐测定方法的改进探讨[J].科研,2016(1):194-194.
[16] 边文耀.硫酸钡比浊法测定生活饮用水中硫酸盐的方法改进[J].疾病监测与控制,2012,6(4):241-241.