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Article
Extraction-Spectrophotometric Determination of Berberine in Crude Drugs by the Formation of a New Ion Associate
A sensitive and selective method based on the formation of ternary complexes of berberine, quinidine and a divalent anion of dibasic acid dyes (A2−) such as Bromophenol Blue, Bromochlorophenol Blue and Bromocreso...
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Article
Extraction-spectrophotometric determination of trace iron (II) in sea water with 2-[2-(3,5-dibromopyridyl)azo]-5-diethylaminobenzoic acid
An extraction-spectrophotometric method is described for the determination of traces of iron(II) with 2-[2-(3,5-dibromopyridyl)azo]-5-diethyl-aminobenzoic acid. The reagent forms a stable and blue 1∶2 iron/rea...
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Article
Gas Chromatographic Determination of Benzoic Acid and Toluic Acid in Airborne Particulates
A method for sensitive determination of aromatic carboxylic acids in airborne particulates is described. Airborne particulates are collected on silica fiber filters with a high volume air sampler. Aromatic car...
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Article
Spectrophotometry Determination of Stimulant Drugs in Urine by Color Reaction with Tetrabromophenolphthalein Ethyl Ester
A new procedure for sensitive and selective determination of stimulant drugs in urine Is described. The method consists of extracting the organic base in alkaline media and performing the color reaction with t...
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Article
Extraction-Spectrophotometric Determination of Pilocarpine in Ophthalmic Solution
Extraction-spectrophotometric determination of pilocarpine with copper(II) and tetrabromophenolphthalein ethyl ester(TBPE) has been developed. Pilocarpine reacts with copper(II) to form a 1:1 stable cationic c...
