自动电位滴定仪应用于地下水六项指标的连续滴定
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摘要
地下水中六项指标(pH、总碱度、氯离子、钙离子、镁离子及硫酸根)的分析需要对每个指标单独进行取样检测,步骤繁琐且效率较低。同时总碱度、氯离子、钙离子、镁离子及硫酸根通常采用手动目视滴定,检测结果存在人为操作误差,精密度和准确度相对较差。本文建立了准确快速测定地下水中六项指标的分析方法,只需2次取样,采用自动电位滴定仪自动判定终点,加液器可精确控制标准溶液加入量至0. 1μL,并且通过调整检测顺序、溶液酸度和加入掩蔽剂的方法消除相互干扰。本方法的加标回收率为93. 5%～120. 0%,相对标准偏差(RSD,n=10)为0. 18%～11. 33%。电位滴定法得到的数据相比标准方法的平行性更好,尤其是当所测定水样较为浑浊或者有颜色时测定数据更稳定。
BACKGROUND: The analysis of six indices( pH,total alkalinity,chloride ion,calcium ion,magnesium ion and sulfate radical) in underground water needed to be sampled separately for each index. The steps were tedious with low efficiency. Furthermore,the total alkalinity,chlorine ion,calcium ion,magnesium ion and sulfate radical usually used manual visual titration,resulting in manual operation error,poor precision,and inaccuracy.OBJECTIVES: To establish an accurate and rapid method for the analysis of six indices in underground water.METHODS: The method established and described in this paper only needed two samples and the Automatic Potentiometric Titrator could determine the end point automatically. The Automatic Potentiometric Titrator could accurately control the addition of standard solution to 0. 1 μL,and eliminate mutual interference by adjusting the detection order,acidity and the addition of a masking agent.RESULTS: The recoveries of this method are 93. 5%-120. 0%,and the relative standard deviations( RSDs,n = 10) are 0. 18%-11. 33%.CONCLUSIONS: The results obtained by potentiometric titration had better parallelism and stability,especially when the measured water samples were more turbid or colored.
BACKGROUND: The analysis of six indices( pH,total alkalinity,chloride ion,calcium ion,magnesium ion and sulfate radical) in underground water needed to be sampled separately for each index. The steps were tedious with low efficiency. Furthermore,the total alkalinity,chlorine ion,calcium ion,magnesium ion and sulfate radical usually used manual visual titration,resulting in manual operation error,poor precision,and inaccuracy.OBJECTIVES: To establish an accurate and rapid method for the analysis of six indices in underground water.METHODS: The method established and described in this paper only needed two samples and the Automatic Potentiometric Titrator could determine the end point automatically. The Automatic Potentiometric Titrator could accurately control the addition of standard solution to 0. 1 μL,and eliminate mutual interference by adjusting the detection order,acidity and the addition of a masking agent.RESULTS: The recoveries of this method are 93. 5%-120. 0%,and the relative standard deviations( RSDs,n = 10) are 0. 18%-11. 33%.CONCLUSIONS: The results obtained by potentiometric titration had better parallelism and stability,especially when the measured water samples were more turbid or colored.
引文
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[15]李珍.自动电位滴定仪测定水中总碱度方法的研究[J].石油化工应用,2013,32(6):89-92.Li Z. Study of measure method for the total alkalinity in water by automatic potentiometric titration[J].Petrochemical Industry Application,2013,32(6):89-92.
[16]潘心红,孙兰,卢玉棋.用自动电位滴定仪测定水中氯化物[J].环境与健康杂志,2002,19(2):142-143.Pan X H,Sun L,Lu Y Q. Determination of chloride in water by automatic potentiometric titrimeter[J]. Journal of Environment and Health,2002,19(2):142-143.
[17]刘小莉,高雪琳,李慧,等.自动电位滴定仪测定循环液中碱度[J].广东化工,2015,42(1):108-109.Liu X L,Gao X L,Li H,et al. Determination of alkalinity in circulating fluid by automatic potentiometric titration[J]. Guangdong Chemical Industry,2015,42(1):108-109.
[18]彭丹.地下水中硫酸根离子检测方法探讨[J].广东化工,2017,44(22):57-58.Peng D. Study on methods to detect sulfate ion of groundwater[J]. Guangdong Chemical Industry,2017,44(22):57-58.
[19]佟琦,高丽华.莫尔法与自动电位滴定法测定水中氯离子含量的比较[J].工业水处理,2008,28(11):69-71.Tong Q,Gao L H. The comparison between Mohr method and automatic potentiometry in determining chloride ion content in water[J]. Industrial Water Treatment,2008,28(11):69-71.
[20]王艳洁,那广水,王震,等.检出限的涵义和计算方法[J].化学分析计量,2012,21(5):85-88.Wang Y J,Na G S,Wang Z,et al. Connotation and calculation methods of detection limit[J]. Chemical Analysis and Meterage,2012,21(5):85-88.
[21]徐金龙,刘中勇,华斌,等.分析化学中检出限问题探讨[J].检验检疫学刊,2012,22(6):74-76.Xu J L,Liu Z Y,Hua B,et al. Discussion of detection limit concept question in analytical chemistry[J]. Journal of Inspection and Quarantine,2012,22(6):74-76.
[2] Mitsuaki S,Yoshida R,Degava M,et al. Determination of peroxyl radical scavenging activity of flavonoids and plant extracts using an automatic potentiometric titrator[J].Journal of Agricultural and Food Chemistry,2003,51(10):2912-2916.
[3]汤海青,欧昌荣,蔡敏俐,等.电位滴定法测定葡萄酒中的抗坏血酸[J].食品工业科技,2017,38(24):264-267.Tang H Q,Ou C R,Cai M L,et al. Determination of ascorbic acid in wines by automatic potentiometric titration[J]. Science and Technology of Food Industry,2017,38(24):264-267.
[4] Caporali S,Bellandi S,Romualdi L. Simultaneous determination of gold and palladium via potentiometric titration[J]. Current Analytical Chemistry,2015,11(3):217-224.
[5]马德起,谷松海,张国胜,等.自动电位滴定测定锰矿石中锰的方法研究[J].岩矿测试,2013,32(4):595-599.Ma D Q,Gu S H,Zhang G S,et al. Determination of total manganese in manganese ores with an automatic potentiometric titration method[J]. Rock and Mineral Analysis,2013,32(4):595-599.
[6]王兵,高丰蕾,杨佩华,等.自动电位滴定仪应用于测定海洋沉积物中有机碳的可行性研究[J].岩矿测试,2016,35(4):402-408.Wang B,Gao F L,Yang P H,et al. Feasibility study on the application of automatic potentiometric titrator in the measurement of organic carbon in marine sediments[J].Rock and Mineral Analysis,2016,35(4):402-408.
[7]赵怀颖,吕庆斌,巩爱华,等.自动电位滴定技术精确测定铜矿石中高含量铜的方法研究[J].岩矿测试,2015,34(6):672-677.Zhao H Y,LüQ B,Gong A H,et al. Accurate measurement of high copper in copper ores with automatic potentiometric titration technique[J]. Rock and Mineral Analysis,2015,34(6):672-677.
[8]朱旭君,杨平平,徐仁扣,等.茶树中总有机酸的自动电位滴定仪测定方法[J].茶叶科学,2014,34(6):572-576.Zhu X J,Yang P P,Xu R K,et al. A method for determination of total organic acids in tea plant with automatic potentiometic titration[J]. Journal of Tea Science,2014,34(6):572-576.
[9]龚宁,伍昌维.全自动电位滴定仪(916Ti-Touch)在测定肥料产品中氯离子含量的应用[J].山东化工,2017,46(10):97-98.Gong N,Wu C W. Application of automatic potentiometric titration instrument(916Ti-Touch)in the determination of chloride ion content in fertilizer products[J]. Shandong Chemical Industry,2017,46(10):97-98.
[10] Wilson D,Alegret S,Valle M. Simultaneous titration of ternary mixtures of Pb(Ⅱ),Cd(Ⅱ)and Cu(Ⅱ)with potentiometric electronic tongue detection[J].Electroanalysis,2015,27(2):336-342.
[11]霍俊霏.地下水中硫酸根离子的测定及方法比较[J].盐业与化工,2014,43(11):36-38.Huo J F. Determination of sulfate ion in groundwater and its method comparison[J]. Journal of Salt and Chemical Industry,2014,43(11):36-38.
[12]窦蓓蕾,杏艳,王舒婷,等.自动电位滴定仪测定水中氯化物的应用研究[J].安徽农学通报,2014,20(19):55-56.Dou B L,Xing Y,Wang S T,et al. Application research on the determination of chloride in water by automatic potentiometric titration instrument[J]. Anhui Agricultural Science Bulletin,2014,20(19):55-56.
[13]张伟,郝珍珍,李铁,等.自动电位滴定法测定海水中的钙[J].海洋湖沼通报,2017(5):87-92.Zhang W,Hao Z Z,Li T,et al. Automatic potentimetric titration for the determination of calcium in seawater[J].Transactions of Oceanology and Limnology,2017(5):87-92.
[14]李莉,郑璇,赵彬,等.自动电位滴定仪测定氯化物的探讨[J].环境科学与技术,2012,35(4):104-106.Li L,Zhang X,Zhao B,et al. Determination of chloride with automatic potentiometric titration[J]. Environmental Science&Technology,2012,35(4):104-106.
[15]李珍.自动电位滴定仪测定水中总碱度方法的研究[J].石油化工应用,2013,32(6):89-92.Li Z. Study of measure method for the total alkalinity in water by automatic potentiometric titration[J].Petrochemical Industry Application,2013,32(6):89-92.
[16]潘心红,孙兰,卢玉棋.用自动电位滴定仪测定水中氯化物[J].环境与健康杂志,2002,19(2):142-143.Pan X H,Sun L,Lu Y Q. Determination of chloride in water by automatic potentiometric titrimeter[J]. Journal of Environment and Health,2002,19(2):142-143.
[17]刘小莉,高雪琳,李慧,等.自动电位滴定仪测定循环液中碱度[J].广东化工,2015,42(1):108-109.Liu X L,Gao X L,Li H,et al. Determination of alkalinity in circulating fluid by automatic potentiometric titration[J]. Guangdong Chemical Industry,2015,42(1):108-109.
[18]彭丹.地下水中硫酸根离子检测方法探讨[J].广东化工,2017,44(22):57-58.Peng D. Study on methods to detect sulfate ion of groundwater[J]. Guangdong Chemical Industry,2017,44(22):57-58.
[19]佟琦,高丽华.莫尔法与自动电位滴定法测定水中氯离子含量的比较[J].工业水处理,2008,28(11):69-71.Tong Q,Gao L H. The comparison between Mohr method and automatic potentiometry in determining chloride ion content in water[J]. Industrial Water Treatment,2008,28(11):69-71.
[20]王艳洁,那广水,王震,等.检出限的涵义和计算方法[J].化学分析计量,2012,21(5):85-88.Wang Y J,Na G S,Wang Z,et al. Connotation and calculation methods of detection limit[J]. Chemical Analysis and Meterage,2012,21(5):85-88.
[21]徐金龙,刘中勇,华斌,等.分析化学中检出限问题探讨[J].检验检疫学刊,2012,22(6):74-76.Xu J L,Liu Z Y,Hua B,et al. Discussion of detection limit concept question in analytical chemistry[J]. Journal of Inspection and Quarantine,2012,22(6):74-76.