DETERMINATION OF CR(VI), CU(II) IN AQUEOU S-SOLUTION BY LIQUID-CORE OPTICAL-FIBER SPECTROPHOTOMETRY

This paper presents the transmission characteristics and spectrum for liquid-core optical fiber filled with low refractive index liquids(n>1 .346) and aqueous solutions. The methods are studied for the determina tion of Cr(VI), Cu(I) in aqueous solutions of about 70% alcohol and 50 % dioxane. With the 110 cm liquid-core optical fiber in length, the se nsitivities(1/ng . mL(-1)) of Cr(VI), Cu(I) are 0.052 and 0.017 respec tively; the linear ranges are 0 similar to 25, 0 similar to 24 ng/mL w ith RSD being 1.0%similar to 4.8%. The Cr in the animal gum and nation al standard are determined with recoveries of 94%similar to 102%.