“An innovative approach to reuse the costly Silver Diethyl Dithio Carbamate (SDDC) solution in the analysis of Arsenic in water samples”

Abstract

In the analysis of Arsenic in water samples the Silver Diethyl Dithio Carbamate being used is a costly
chemical and its solution is prepared in chloroform. This yellow colour reagent is used to absorb AsH3 gas produced
in the reaction flask. It is absorbed by the yellow coloured Silver Diethyl Dithio Carbamate solution containing in utube and changed into reddish colouration. The reddish colour intensity is increased by the increase of arsenic present
in the water sample which is measured by spectrophotometer at the wavelength of 520 nm. Generally arsenic is not
found in most of the samples of drinking water in that case the formation and absorption of AsH3 does not occur in
the solution of Diethyl Dithio Carbamate as the reading shows ‘0’. Thus the solution of SDDC is remaining as such
without any change in colour and that can be reuse for further analysis of arsenic, if collected instead of throwing it
away. Thus under the utilization of the waste the utilization of ‘0’ Arsenic containing SDDC is successfully found
useful and satisfactory for further determination of Arsenic. The used SDDC is also used as blank zero to minimize
any error. Precautionary it should be filter by 40 no. Whatman filter paper before being reused to avoid any turbidity
formed on keeping the used solution of SDDC. Thus the SDDC solution should be very clear to use.