Sodium 1,Znaphthoquinone 4-sulphonate (NQS) was tested as a reagent for amphetamine in order to develop an extractive-spectrophotometric method for the determination of the drug in urine samples. The standard additions method showed the absence of proportional bias error whereas the Youden method an
Continuous-flow spectrophotometric determination of amino acids with 1,2-naphthoquinone-4-sulphonate reagent
✍ Scribed by J. Saurina; S. Hernández-Cassuo
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 569 KB
- Volume
- 283
- Category
- Article
- ISSN
- 0003-2670
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## AIMtraCt The determination of amphetamine and methamphetamine in urine by the H-point standard additions method (HPSAM) is described. An extraction-spectrophotometric method for the determination of these drugs with sodium 1,Znaphthoquinone 4-sulphonate using n-hexane-ethyl acetate (1: 1) as th
Salbutamol can be determined spectrophotometrically at 605 nm after flow-injection extraction into chloroform after oxidative coupling with 4-amino-N,N-dimethylaniline. The carrier stream is distilled water and the reagents streams contain 5% (w/v) sodium hydrogencarbonate, 0.5% (w/v) potassium hex
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