Metal speciation is increasingly considered to be an indispensible technique in environmental and toxicological assessments.Determination strictly based on total elemental concentration has become incomplete,if not trivial,as knowledge increases about the significant differences in toxicity,chemical reactivity and bioavailability of different chemical forms of each element.For instance,Cr(Ⅲ) and Cr(Ⅵ) are two well known for their contrasting physiological significance.[1] Inorganic arsenics,possess the highest toxicity among the family of more than 20 chemical forms.[2] Selenium,on one hand is a key element for various enzyme formations,can lead to selenosis at high dosage.[3] The wide array in the physiological functions of the abovementioned species of heavy metals triggered our attempt to develop a rapid,multi-elemental speciation method for eco-environmental applications.