Direct chronoamperometric determination of free available chlorine in soil samples using built-in diffusion layer coated glassy carbon electrode

In this work, a glassy carbon electrode supplied with a built-in diffusion layer and a short-time chronoamperometric method were used for obtaining reliable concentration values from I–t curves recorded in tortuous media. It was proved that short-time chronoamperometric transients taken with the modified electrode in tortuous matrices can be evaluated using calibrating data recorded in simple aqueous standards. The applicability of the in situ analytical method was tested for determination of active chlorine concentration in different bleaching powder treated soil samples. Iodometric titrations were employed for comparison. The results prove that residual concentration of active chlorine can be estimated with 0.66 % relative standard deviation using the proposed in situ chronoamperometric measuring methods in humid soil slurry after bleaching powder disinfection.