Options
Spectrophotometric determination of sulfamic acid in metal sulfamate bath effluents
Date Issued
01-04-2005
Author(s)
Deepa, B.
Nagaraja, K. S.
Balasubramanian, N.
Abstract
A proposed spectrophotometric method for the determination of sulfamic acid involves acid hydrolysis of sulfamic acid to form ammonium sulfate. The formed ammonium sulfate is determined based on the Berthelot reaction using salicylic acid, sodium hypochlorite and sodium nitroprusside. The γmax for the indophenol dye formed is 648 nm and the calculated molar absorptivity is 1.9 × 104 L/mol-cm. Beer's law is obeyed in the concentration range of 0 to 70 μg and the relative standard deviation is 2% for n = 10 at 50 μg levels of sulfamic acid. The method was applied to determine sulfamic acid in the effluents of nickel and lead sulfamate electroplating baths. The results obtained were validated by recovery studies of added sulfamic acid.
Volume
92