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-A spectrophotometric method employing 2-hydroxybenzaldiminoglycine (HBIG) is proposed for the determination of chromium(III). The results of the determinations are compared with the standard diphenyl carbazide method. The presently developed method is direct, simple, rapid, selective, sensitive and precise.

A simple and rapid spectrophotometeric procedure has been established for quantization of Ni(II) at trace levels. The reagent isonicotinohydroxamic acid (INHA) reacts with nickel(II) at pH < 10 and form a 1:2 lemon green complex. The complex has a maximum absorption at 610 nm with the molar absorptivity of 1.44x10 4 L mol -1 cm -1 . Beer's law is obeyed over the range of 0.32-4.80 μgmL -1 . The Sandell's sensitivity for 0.001 absorbance unit is 4×10 -3 μgcm -2 . The relative standard deviation at 3.20 μgmL -1 is 1.1% (n = 6). The tolerance limits for interfering ions are discussed. All variables were studied in order to optimize the reaction conditions. The efficacy of the proposed method is shown by the successful application of determining nickel in water, wastewater and alloy and the accuracy was determined by recovery experiment.

A spectrophotometry method for the determination of nickel (II) with nicotinohydroxamic acid (NHA) in the presence of Triton X-100 was studied at pH 9.0 using phosphate-borax buffer medium. Molar absorptivity of the sensitized complex was 1.37 × 10 4 L mol -1 cm -1 at 530 nm and adhered to Beer's law in the concentration range 0.43-8.56 μg mL -1 of nickel (II). The molar composition of the sensitized complex was 1:2 (nickel-NHA). The possible interfering effects of various ions were studied. The method was used for the determination of nickel in tap water and alloy samples.

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