土壤全硫测定方法的改进及其在燃煤电厂周边土壤分析中的应用
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摘要
为了提高硫酸钡比浊法测定土壤中全硫含量方法的准确性,对其进行改进,考察了乙酸和硝酸镁添加量对比浊液吸光度的影响,并对某燃煤电厂周边土壤样品进行测定。结果表明:乙酸溶液(1∶1)和硝酸镁溶液(308 g/L)的最佳添加量分别为15、5 mL。改进后的方法具有较高的准确度和精确度。某燃煤电厂周边土壤全硫的含量范围为95.71～1 102.03 mg/kg,平均值为412.48 mg/kg,总体平均含量未超过全国一般水平,但有32%的样品高于全国一般水平,说明该燃煤电厂周边土壤的硫发生了一定程度的蓄积,需引起重视。
The method for determination of total sulfur in soil sample by BaSO_4 turbidimetric method was improved in this study.Experiments were conducted in order to determine the optimum conditions by studying various parameters,including CH_3 COOH and Mg(NO_3)_2 dosage.Sulfur contents of soil samples from a coal-fired power plant were determined with the improved method.The results showed that the optimal dosage of CH_3 COOH(1∶1)and Mg(NO_3)_2(308 g/L)were 15 mL and 5 mL,respectively.The improved method had high accuracy and precision.The total sulfur content of soil around the coal-fired power plant ranged from 95.71 mg/kg to 1 102.03 mg/kg,and the average was 412.48 mg/kg,which did not exceed the national average level.However,32% of the samples were above the national average,indicated that soil sulfur accumulated to a certain extent around the coal-fired power plant,and should be paid more attention.
The method for determination of total sulfur in soil sample by BaSO_4 turbidimetric method was improved in this study.Experiments were conducted in order to determine the optimum conditions by studying various parameters,including CH_3 COOH and Mg(NO_3)_2 dosage.Sulfur contents of soil samples from a coal-fired power plant were determined with the improved method.The results showed that the optimal dosage of CH_3 COOH(1∶1)and Mg(NO_3)_2(308 g/L)were 15 mL and 5 mL,respectively.The improved method had high accuracy and precision.The total sulfur content of soil around the coal-fired power plant ranged from 95.71 mg/kg to 1 102.03 mg/kg,and the average was 412.48 mg/kg,which did not exceed the national average level.However,32% of the samples were above the national average,indicated that soil sulfur accumulated to a certain extent around the coal-fired power plant,and should be paid more attention.
引文
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[3]郝庆菊,王其存.我国煤炭开采和燃烧过程中的硫污染对土壤环境的影响[J].新疆环境保护,2001,23(2):34-38.
[4]Mowat G,Curtis P J,Lafferty D J R.The influence of sulfur and hair growth on stable isotope diet estimates for grizzly bears[J].Plos One,2017,12(3):e0172194.
[5]Zeng M F,de Vries W,Bonten L T C,et al.Model-based analysis of the long-term effects of fertilization management on cropland soil acidification[J].Environmental Science&Technology,2017,51(7):3843-3851.
[6]李忠佩,吴晓晨,陈碧云.不同利用方式下土壤有机碳转化及微生物群落功能多样性变化[J].中国农业科学,2007,40(8):1712-1721.
[7]黄利英.西藏土壤全硫测定的初探[J].西藏农业科技,2013,35(2):28-30.
[8]傅娇艳,丁振华,吴彦慜,等.硫酸钡分光光度比浊法测定高硫环境样品[J].厦门大学学报(自然科学版),2007,46(6):880-883.
[9]席改卿,庞秀言.硫酸钡比浊法分散体系的稳定性研究[J].河北师范大学学报(自然科学版),2007,31(4):503-505.
[10]张雪霞,张晓霞,陈能场,等.高硫高铁土壤全硫提取和测定方法的改进[J].生态环境学报,2013,22(11):1841-1845.
[11]路兴和,曹洪涛,陈俊.硝酸镁法消解-离子色谱法测定城市污泥中的全硫[J].中国给水排水,2015,31(24):109-111.
[12]张玉荣,禹飞.土壤中全硫的测定[J].安徽农学通报,2008,14(9):217.
[13]林舜华,黄银晓,蒋高明,等.海河流域植物硫素含量特征的研究[J].生态学报,1994,14(3):235-242.
[14]曾东瑜,陈凡植,郭洁茹,等.国产化是我国未来烟气脱硫的发展方向[J].广东电力,2004,17(1):10-13.