Adsorptive Stripping and Square Wave Voltammetric Determination of2-Mercaptobenzothiazole in Heat ExchangerCooling Waters

Sensiliv~ .rimple andreproducible adsorptive stripping andalso square-wave voltammetric methods aredeJlelopedjOrdetermination if2-mercaptobenzothiazole (Y.Bl) in indllstrialheat exchanger cooling water. Athree electrode Jystem containing SMD£ working electrod~ Pt auxiliary electrode andAgi4gCIrqerenceelectrode was usedthroughout. Thir methodis ba.red on adrorptive accumu/ar/o» {(Ithe M.BTat concearrano»range if0.5 - 6.(JJIg mEl at a SUD£(Occumulation potential = +0.OSP)/01ʹ 40s. 77Jen a po/ential,fʹweeptowardnegative values war iniliated which yielda peal at -0.2J>4 r versus Ag///gClrqerence electrode. Toachieve high ,rensitivi(y and be.rt regres.rirJll coʹ!!ficiellt./Or calibration graph various experimental andinstl7lmental variableJʹsuch arpll blf!ftr volum~ ionic .rtrength, accumulationpotentialandtime, ftequen{.J~pulse hetght and mercury drop size were invest(gated A .rquare-wave mltammetric method wllhout anypreconcentration accumulationpotentialprocess was also appliedjOrdetermination ifhigher concentrationrange 0/M.BT (7.0 - 4fJ. 0 JIg m[~. Calibration graphs ,rhowedgoodlineari(y in the concearrar/on ranges 0/fJ. 5 - 6.0 JIg »u:ʹ and 7.0 - 40.0 JIg m[1 f!fM.BT and regreJ:rion cotfficients 0/ fJ.99J>9 and 0.9999 areobtained reJpective(y. The equation.f (Ai) = J0.477CMBT - /3.466 (fOr 05{}-(i0 «g m£l, n = 6) and (111)=1375CAlIIT - 9./37 (lor 7.0- 40.0 cxg m£I, n = /4), are oblainedjOr calculation o/M.BTconcentration in theJumple solulion, where C is the concentration f!fM.BT in JIg mEl and r;Ji) is the d(tJerence betweenvoltammogramspeak Cllrrenl o/.rample andblank solultfJll in JlA. The LOD 0/the methodis obtainedto be4.4x/(j2 JIg m£1 alld the relative standard deviations .RSD (11=20) at 0.;:. 4; /0 and .10 JIg mEl o/ʹ.M.BTconcentration levels were 1.14fJ1J, 17.1;;;;ʹ 1.10;;;;and IJ6Yi respettive(y.