基于NPsNi-Nafion-GO修饰平面电极和3D薄层流通池的水体化学耗氧量快速检测系统
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摘要
目的建立流动状态下检测水体化学耗氧量(COD)的电化学分析方法。方法以NPsNi-Nafion-GO修饰的平面电极与3D打印薄层流通池相匹配,用微型蠕动泵驱动样品流经电极表面,用计时电流法进行测定。结果所建立的动态测定装置对COD响应时间为1.5min,测定范围1～400mg/L,线性方程i(μA)=1.737 5 c (mg/L)-0.896 6,线性相关系数(r)为0.996 1,检出限0.2mg/L,样品需求量2mL,相对偏差(RSD)为2.5%～3.9%(n=9),与标准方法(GB/T 5750.7-2006)测定结果进行比较,相对误差在3.0%～6.4%。结论该检测系统与标准检测方法具有良好相关性,灵敏度高,操作简单,避免二次污染,便携优势较突出。
Objective To establish a electrochemical analysis system for rapid determination of chemical oxygen demand(COD)in flow state.Methods A planar electrode modified with NPsNi-Nafion-GO was matched with a 3 Dprinted thin-layer cell.The sample was driven smoothly through the electrode surface by a micro peristaltic pump and then measured by chronoamperometry.Results The response time of established mobile detection system was 1.5 min,the linear range of COD was 1-400 mg/L.The linear equation was i(μA)=1.737 5 c(mg/L)–0.896 6(r=0.996 1)and the detection limit was 0.2 mg/L.The sample demand was 2 mL.The relative deviation(RSD)was 2.5%-3.9%(n=9).Compared with the results by the standard method(GB/T 5750.7-2006),the relative errors of results by established method were from 3.0% to 6.4%.Conclusion The established system have good correlation with standard detection method,with high sensitivity,simple operation,avoiding secondary pollution,demonstrating prominent advantage of portability.
Objective To establish a electrochemical analysis system for rapid determination of chemical oxygen demand(COD)in flow state.Methods A planar electrode modified with NPsNi-Nafion-GO was matched with a 3 Dprinted thin-layer cell.The sample was driven smoothly through the electrode surface by a micro peristaltic pump and then measured by chronoamperometry.Results The response time of established mobile detection system was 1.5 min,the linear range of COD was 1-400 mg/L.The linear equation was i(μA)=1.737 5 c(mg/L)–0.896 6(r=0.996 1)and the detection limit was 0.2 mg/L.The sample demand was 2 mL.The relative deviation(RSD)was 2.5%-3.9%(n=9).Compared with the results by the standard method(GB/T 5750.7-2006),the relative errors of results by established method were from 3.0% to 6.4%.Conclusion The established system have good correlation with standard detection method,with high sensitivity,simple operation,avoiding secondary pollution,demonstrating prominent advantage of portability.
引文
[1]张祥琼,刘波,张凌云.电化学分析法在水质分析与监测中的应用综述[J].城镇供水,2018,(1):31-35.
[2]Yang JQ,Chen JW,Zhou YK,et al.A nano-copper electrochemical sensor for sensitive detection of chemical Oxygen demand[J].Sens Actuators B Chem,2011,153(1):78-82.
[3]Wu KB,Wu C,Wang JQ.Electrochemical sensing chemical oxygen demand based on the catalytic activity of cobalt oxide film[J].Anal chim acta,2012,736:55-61.
[4]Jing T,Zhou YS,Hao QL,et al.A nano-nickel electrochemical sensor for sensitive determination of chemical Oxygen demand[J].Anal Methods,2012(4):1155-1159.
[5]Li J,Li L,Zheng L,et al.Rh2O3/Ti electrode preparation using laser anneal and its application to the determination of chemical Oxygen demand[J].Meas Sci Technol,2006,17(7):1995-2000.
[6]Mo HL,Tang Y,Wang XZ,et al.Development of a Three-Dimensional structured Carbon fiber felt/beta-PbO2electrode and its application in chemical Oxygen demand determination[J].Electrochim Acta,2015,176:1100-1107.
[7]Wang J,Li K,Yang C,et al.Ultrasound electrochemical determination of chemical Oxygen demand using boron-doped diamond electrode[J].Electrochem commun,2012,18:51-54.
[8]Luo J,Jiang SS,Zhang HY,et al.A novel non-enzymatic glucose sensor based on Cu nanoparticle modified graphene sheets electrode[J].Anal Chim Acta,2012,709:47-53.
[9]Mahale NK,Ingle ST.Electrocatalytic Hydrogen evolution reaction on nano-nickel decorated graphene electrode[J].Energy,2017,119:872-878.
[10]Nguyen QD,Patil D,Jung H,et al.A high-performance nonenzymatic glucose sensor made of CuO-SWCNT nanocomposites[J].Biosens Bioelectron,2013,42(1):280-286.
[11]贺小云,王济奎,洪颖,等.基于3D打印薄层池和流场形电极的镉离子流动检测系统[J].分析化学,2017,45(1):7-13.
[2]Yang JQ,Chen JW,Zhou YK,et al.A nano-copper electrochemical sensor for sensitive detection of chemical Oxygen demand[J].Sens Actuators B Chem,2011,153(1):78-82.
[3]Wu KB,Wu C,Wang JQ.Electrochemical sensing chemical oxygen demand based on the catalytic activity of cobalt oxide film[J].Anal chim acta,2012,736:55-61.
[4]Jing T,Zhou YS,Hao QL,et al.A nano-nickel electrochemical sensor for sensitive determination of chemical Oxygen demand[J].Anal Methods,2012(4):1155-1159.
[5]Li J,Li L,Zheng L,et al.Rh2O3/Ti electrode preparation using laser anneal and its application to the determination of chemical Oxygen demand[J].Meas Sci Technol,2006,17(7):1995-2000.
[6]Mo HL,Tang Y,Wang XZ,et al.Development of a Three-Dimensional structured Carbon fiber felt/beta-PbO2electrode and its application in chemical Oxygen demand determination[J].Electrochim Acta,2015,176:1100-1107.
[7]Wang J,Li K,Yang C,et al.Ultrasound electrochemical determination of chemical Oxygen demand using boron-doped diamond electrode[J].Electrochem commun,2012,18:51-54.
[8]Luo J,Jiang SS,Zhang HY,et al.A novel non-enzymatic glucose sensor based on Cu nanoparticle modified graphene sheets electrode[J].Anal Chim Acta,2012,709:47-53.
[9]Mahale NK,Ingle ST.Electrocatalytic Hydrogen evolution reaction on nano-nickel decorated graphene electrode[J].Energy,2017,119:872-878.
[10]Nguyen QD,Patil D,Jung H,et al.A high-performance nonenzymatic glucose sensor made of CuO-SWCNT nanocomposites[J].Biosens Bioelectron,2013,42(1):280-286.
[11]贺小云,王济奎,洪颖,等.基于3D打印薄层池和流场形电极的镉离子流动检测系统[J].分析化学,2017,45(1):7-13.