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Extraction and Micro Determination of Niobium(V) with N-α-Phenylstyrylacrylohydroxamic Acids

✍ Scribed by Kalpesh Patel; S.K. Menon; Y.K. Agrawal

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
60 KB
Volume
53
Category
Article
ISSN
0026-265X

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✦ Synopsis

A sensitive and selective method for the extraction and microgram determination of niobium(V) with N-p-chlorophenyl-␣-phenylstyrylacrylohydroxamic acid (PCPPSAHA) is described. The niobium-PCPPSAHA complex has a max of 385 nm and a molar absorptivity of 3.7 × 10 4 l mol -1 cm -1 . The system obeys Beer's law in the range 0.2-4 ppm of niobium(V). The Sandell sensitivity is 0.0025 g cm 2 . The sensitivity of the method is increased using thiocyanate. The Nb-PCPPSAHA-SCN complex has a max of 390 nm and a molar absorptivity 4.7 × 10 4 l mol -1 cm -1 . Niobium is directly determined by graphite furnace atomic absorption spectrophotometry with detection limit 20 pg.

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## Abstract A rapid extraction and spectrophotometric determination of palladium with N‐p‐chlorophenylbenzohydroxamic acid (N‐p‐Cl‐BHA) is described. The palladium forms an orange coloured complex with N‐p‐Cl‐BHA at pH 3.0. It is extracted with chlorobenzene and has a maximum absorbance at 430 nm.