Simple and rapid spectrophotometric determination of..., R. SOOMRO, et al.,
higher than the value observed in the aqueous solution, resulting in an increase in the sensitivity and selectivity
of the method. The apparent molar absorptivities were found to be 3.5 × 105 L mol−1 cm−1 aqueous micellar
media. Compared with other methods in the literature (Table 1), the proposed method has several remarkable
analytical characteristics:
1. the proposed method is highly sensitive with molar absorptivity of the complex of 3.5 × 105 L mol−1
cm−1 . Thus, amount of ng g−1 of chromium can be determined without pre-concentration;
2. the proposed method is very simple, rapid, and stable. The reaction of chromium(VI) with BSOPD is
completed rapidly in micellar medium within 1 min at room temperature so it does not involved any
stringent reaction conditions and offer the advantages of high complex stability (24 h).
3. the method has the added advantage of determining individual amounts of Cr(VI) and Cr(III).
With suitable masking, the reaction can be made highly selective. The proposed method using BSOPD in
the presence of aqueous micellar solutions not only is one of the most sensitive methods for the determination of
chromium but also is excellent in terms of selectivity and simplicity. Therefore, this method will be successfully
applied to the monitoring of trace amounts of chromium in real, environmental, industrial effluent and biological
samples.
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