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1516634 
Journal Article 
Spectrophotometric determination of microgram amounts of chromium(VI) and total chromium in wastewater 
Wei, FS; Zhu, YR; Qu, PH; Yin, F; Shen, NK 
1982 
1 
Microchimica Acta
ISSN: 0026-3672
EISSN: 1436-5073 
2 
1-2 
67-76 
HEEP COPYRIGHT: BIOL ABS. A spectrophotometric method was developed for the determination of Cr in wastewater with 5-Br-PADAP (2-(5-bromo-2-pyridylazo)-5-diethylaminophenol). Cr (III) formed a blue-purple complex at pH 4.7 upon heating. The color was stable and highly sensitive for Cr. At 600 nm it obeyed Beer's law in the concentration range 0-15 mug Cr(III)/25 ml. The sensitivity and molar absorptivity of the reaction were 0.00065 mug Cr(III)/cm2 and 7.93e continuous variation and molar ratio methods indicated that Cr formed a 1:2 complex with the ligand. 
18540-29-9; 7440-47-3 
IRIS
• Chromium VI
     Considered
          Excluded
               Other Not Pertinent