Hydride generation is one of the most often used techniques for generation of volatile compounds. There ‎are two main methods of hydride generation; namely, Chemical hydride generation and Electrochemical ‎hydride generation.‎ Arsenic and its chemical species have been identified as carcinogens. The toxicity is highly ‎dependent upon the chemical form in which it is present, for example As(III) and As(V) are ‎predominantly toxic. There for it is of great importance to improve the determination of arsenic species for ‎the study of its chemical behavior and environmental toxicology.‎ Hydride generation (HG) is well–stablished technique for determination of arsenic(As) in a wide ‎range of samples[I-2]. HG-coupled with colourimetric detection is a simple, low cost and sensitive ‎method for determination of As in sample. The method is based on collection of AsH3 generated in a ‎SDDC-organic base solution and on subsequent reaction of AsH3 with SDDC to form a coloured As(DDC)3 complex [1-2].‎ In this study, the effects of organic solvents such as Acetonitrile, Dimethylsulfoxide, ethanol, methanol, and 2-‎Propanol on the HG-Spectrophotometric determination of As(III) and As(IV) has been investigated. After ‎optimizing the influencing parameters, the majority of the investigated solvent showed an increasing effect on ‎the measured absorbance. Thus, it is proposed to use organic solvent as a modifier in CHG and ECHG of ‎As(Ill) and As(V).‎

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