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)/01' 40s. 77jen a po/ential,f'weeptowardnegative values war iniliated which yielda peal at -0.2j>4 r versus ag///gclrqerence electrode. toachieve high ,rensitivi(y and be.rt regres.rirjll co'!!ficiellt./or calibration graph various experimental andinstl7lmental variablej'such 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:' 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/'.m.btconcentration levels were 1.14fj1j, 17.1;;;;' 1.10;;;;and ij6yi respettive(y.