基于氯化钡滴定法的洗盐效果研究
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摘要
洗盐效果是盐渍土工程性质和土壤改良研究领域的焦点问题之一。为了研究氯化钡滴定法的合理性以及洗盐后盐渍土性状的改良效果,结合分析盐渍土的洗盐机理,采用蒸馏水浸泡过滤的方法对青海茶卡盐渍土做了洗盐处理,并采用BaCl_2溶液滴定法对该方法洗盐的洗盐效果进行检验,对比了洗盐前后盐渍土的颗粒分析试验和易溶盐离子分析试验。结果表明:茶卡地区盐渍土经过洗盐处理后,土体粗粒组即粒径大于2 mm,按比例减少14.37%,相应细粒组组份增大14.37%;盐渍土中易溶盐含量最少降低至0.096%到非盐渍土的标准。但由于空气中CO_2与水的作用,碳酸氢盐含量增加0.023%。因此使用BaCl_2溶液滴定法检验青海茶卡盐渍土的洗盐效果是有效的方法,且仅适合作为定性研究的判定依据。
The effect of salt washing is one of the key issues in the field of engineering properties and soil improvement of saline soil. In order to study the rationality of the barium chloride titration method and the improvement effect of the saline soil properties after washing with salt,combined with the analysis of the salt washing mechanism of saline soil,the method of soaking and filtering in distilled water was used to do salting treatment on the Chaka saline soil in Qinghai. The salt washing effect of this method was examined and treated with BaCl_2 solution titration method. The particle analysis test and salt-soluble ion analysis test of saline soil before and after salt washing were carried out. The results showed that the coarse-grained soil group with a particle size greater than 2 mm reduced in proportion by 14. 37%,and the corresponding fine-grained composition increased by 14. 37%,and the soluble salt content in saline soil was reduced to 0. 096%,which meets the standard of non-saline soil. However,due to the effect of carbon dioxide in the air and water,the bicarbonate content increased by approximately 0. 023%. Therefore,using the BaCl_2 solution titration method to test the salt washing effect of Qinghai Chaka saline soil is an effective method,and it is only suitable as a qualitative criterion.
The effect of salt washing is one of the key issues in the field of engineering properties and soil improvement of saline soil. In order to study the rationality of the barium chloride titration method and the improvement effect of the saline soil properties after washing with salt,combined with the analysis of the salt washing mechanism of saline soil,the method of soaking and filtering in distilled water was used to do salting treatment on the Chaka saline soil in Qinghai. The salt washing effect of this method was examined and treated with BaCl_2 solution titration method. The particle analysis test and salt-soluble ion analysis test of saline soil before and after salt washing were carried out. The results showed that the coarse-grained soil group with a particle size greater than 2 mm reduced in proportion by 14. 37%,and the corresponding fine-grained composition increased by 14. 37%,and the soluble salt content in saline soil was reduced to 0. 096%,which meets the standard of non-saline soil. However,due to the effect of carbon dioxide in the air and water,the bicarbonate content increased by approximately 0. 023%. Therefore,using the BaCl_2 solution titration method to test the salt washing effect of Qinghai Chaka saline soil is an effective method,and it is only suitable as a qualitative criterion.
引文
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[3]王佳丽,黄贤金,钟太洋,等.盐碱地可持续利用研究综述[J].地理学报,2011,66(5):673-684.
[4]罗友弟.青海地区盐渍土分布规律及其盐胀溶陷机制探讨[J].水文地质工程地质,2010,37(4):116-120.
[5]蒋国军,王建科,邵伟强,等.降低保护地土壤盐分研究[J].节水灌溉,2016(3):49-51.
[6]郑东峰,李彦,张玉兰,等.滴灌洗盐改良滨海盐渍土效果的研究[J].植物营养与肥料学报,2000,6(s1):80-82.
[7]郑东峰,孙泽强,王学君等.利用降水改良滨海盐渍土的技术方法与研究初报[J].山东农业科学,2010(2):64-66.
[8]邴慧,武俊杰,邓津.黄土状盐渍土洗盐前后物理力学性质的变化[J].冰川冻土,2011,33(4):796-800.
[9]GUARNIERI A,FABBRI A,MOLARI G.Influence of sodicity and salinity on the mechanical properties of two Italian soils.[J].Biosystems Engineering,2005,91(2):239-243.
[10]BROUCHKOV A.Frozen saline soils of the Arctic coast:their distribution and engineering properties[C]//Proceedings of the Eighth International Coference on Permafrost.Zurich:Zurich press,2003,7:95-100.
[11]RADOSLAW L,MICHALOWSKI,MING ZHU.Frost heave modeling using porosity rate function[J].International Journal for Numerical and Analytical Methods in Geomechanics,2006,30:703-722.
[12]CARY J W.A New Method for Calculating Frost Heave Including Solute Effects[J].WATER RESOURCES RESEARCH,1987,23(8):1620-1624.
[13]NIXON J F MCROBEKT E C.A Study of Some Factors Affecting the Thawing of Frozen Soils[J].CAN GEOTECH.J,1973,12(3):439-452.
[14]VASIL'EV V I.A.M.Maksimov.Mathematical Model of the Freezing-Thawing of Saline Frozen Soil[J].Journal of Applied Mechanics and Technical Physics,1995,36(5):689-696.
[15]中华人民共和国水利部.土工试验规程:SL237—1999[S].北京.水利水电出版社,1999:49-56.
[16]中国科学院南京土壤研究所.中华人民共和国土壤图[Z].北京:地图出版社,1978.
[17]温利强.我国盐渍土的成因及分布特征[D].合肥:合肥工业大学,2010.
[18]郭铌,张杰,梁芸.西北地区近年来内陆湖泊变化反映的气候问题[J].冰川冻土,2003(2):211-214.
[19]李海民,徐晓东,李纪泽.茶卡盐湖湖表卤水摸拟动态蒸发试验研究[J].盐湖研究,1998(1):11-17.
[20]徐红梅.筛析法颗粒分析试验[J].电脑知识与技术,2014,10(9):1860-1863.
[21]林叶彬.北方滨海盐渍土冬季覆冰洗盐改土实验研究[D].北京:北京师范大学,2011.
[22]罗新正,孙广友.松嫩平原大安古河道强度盐渍土种稻脱盐试验[J].土壤通报,2007,38(1):72-76.