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This work presents a novel, simple, rapid, and cost effective method for semi-quantitative analysis of arsenic(III) in water sample. The method was based on the digital image colorimetry (DIC) of difluoroboron-curcumin doped starch film (BF 2 -cur-film) and arsenic ion in water. A red BF 2 -cur-film (9.4 μm) was fabricated by entrapped difluoroboron-curcumin (BF 2 -curcumin, particle size of 60 - 113 nm) in tapioca starch film. When the standard solution of arsenic (1 mL) was added into small plastic tube containing BF 2 -cur-film on its inner lid, blue solution (λ max at 610 nm) was observed instead of orange color in blank solution (λ max at 495 nm). When BF 2 -cur-film was used in conjunction with DIC, a wide linear range of 0 - 10 mg L -1 with good linearity (R 2 &gt; 0.99) was obtained from green channel with low detection limit of 0.04 mg L -1 . Moreover, good precision (0.9 - 1.2%RSD, n = 4 days) and accuracy (0.03% relative error) were also achieved.

Difluoroboron-Curcumin Doped Starch Film and Digital Image Colorimetry for Semi-Quantitative Analysis of Arsenic