环境污染与防治
環境汙染與防治
배경오염여방치
ENVIRONMENTAL POLLUTION AND CONTROL
2009年
12期
58-63
,共6页
液/液界面%滴液电极%促转移%铅
液/液界麵%滴液電極%促轉移%鉛
액/액계면%적액전겁%촉전이%연
liquid/liquid interface%dropping electrolyte electrode%assisted ion transfer%lead
利用自制的滴液电极,运用循环伏安和方波伏安法,对Pb~(2+)在水/甲基异丁基酮(MIBK)界面上通过双硫腙(HDz)促迁移的反应机制进行了研究.结果表明,该迁移过程为不可逆过程,Pb~(2+)的迁移峰电位为0.122 V,且当Pb~(2+)摩尔浓度为5.0×10~(-7)～4.0×10~(-5)mol/L时,峰电流和Pb~(2+)浓度呈线性相关关系;水相中常见的Na~+等金属离子浓度比Pb~(2+)浓度大百倍时,或水相中常见的Mg~(2+)、Ni~(2+)浓度与Pb~(2+)浓度相同时,对峰电流测定结果产生的干扰都较小(相对误差小于10.0%),但当水相中有Zn~(2+)、Cu~(2+)、Fe~(3+)存在时,即使其浓度都与Pb~(2+)浓度相同,也会对峰电流测定结果产生明显干扰(相对误差分别为-12.2%、-28.7%、-60.3%);以方波伏安法取代循环伏安法进行峰电流测定,以新型绿色溶剂室温离子液体(RTILs)取代四苯硼四丁基铵作为有机相电解质,能极大提高Pb~(2+)浓度测定的灵敏度.
利用自製的滴液電極,運用循環伏安和方波伏安法,對Pb~(2+)在水/甲基異丁基酮(MIBK)界麵上通過雙硫腙(HDz)促遷移的反應機製進行瞭研究.結果錶明,該遷移過程為不可逆過程,Pb~(2+)的遷移峰電位為0.122 V,且噹Pb~(2+)摩爾濃度為5.0×10~(-7)～4.0×10~(-5)mol/L時,峰電流和Pb~(2+)濃度呈線性相關關繫;水相中常見的Na~+等金屬離子濃度比Pb~(2+)濃度大百倍時,或水相中常見的Mg~(2+)、Ni~(2+)濃度與Pb~(2+)濃度相同時,對峰電流測定結果產生的榦擾都較小(相對誤差小于10.0%),但噹水相中有Zn~(2+)、Cu~(2+)、Fe~(3+)存在時,即使其濃度都與Pb~(2+)濃度相同,也會對峰電流測定結果產生明顯榦擾(相對誤差分彆為-12.2%、-28.7%、-60.3%);以方波伏安法取代循環伏安法進行峰電流測定,以新型綠色溶劑室溫離子液體(RTILs)取代四苯硼四丁基銨作為有機相電解質,能極大提高Pb~(2+)濃度測定的靈敏度.
이용자제적적액전겁,운용순배복안화방파복안법,대Pb~(2+)재수/갑기이정기동(MIBK)계면상통과쌍류종(HDz)촉천이적반응궤제진행료연구.결과표명,해천이과정위불가역과정,Pb~(2+)적천이봉전위위0.122 V,차당Pb~(2+)마이농도위5.0×10~(-7)～4.0×10~(-5)mol/L시,봉전류화Pb~(2+)농도정선성상관관계;수상중상견적Na~+등금속리자농도비Pb~(2+)농도대백배시,혹수상중상견적Mg~(2+)、Ni~(2+)농도여Pb~(2+)농도상동시,대봉전류측정결과산생적간우도교소(상대오차소우10.0%),단당수상중유Zn~(2+)、Cu~(2+)、Fe~(3+)존재시,즉사기농도도여Pb~(2+)농도상동,야회대봉전류측정결과산생명현간우(상대오차분별위-12.2%、-28.7%、-60.3%);이방파복안법취대순배복안법진행봉전류측정,이신형록색용제실온리자액체(RTILs)취대사분붕사정기안작위유궤상전해질,능겁대제고Pb~(2+)농도측정적령민도.
The transfer of Pb(Ⅱ) facilitated by dithizone (HDz) presents in the methyl isobutyl ketone across the polarized water/ MIBK interface has been investigated systematically by novel dropping electrolyte electrode using cyclic voltammetry (CV) and square wave voltammetry(SWV). The process is irreversible and controlled by diffusion. The transfer potential is 0.122 V, and the concentration of Pb~(2+) from 5.0×10~(-7) mol/L to 4.0×10~(-5)mol/L is a linear relative to peak current. Traditional organic electrolyte tetrabutylammounium tetraphenylborate is substituted by room temperature ionic liquids (RTILs) 1-butyl-3-methyl imidazolium hexafluorophosphate. The effect of concentration of RTILs on the peak current has been investigated. Determination of heavy metal ion by novel dropping electrolyte using CV and SWV has prospective application in the online and situ-determination of heavy metal ion for its simple, stability and sensibility.
