✦ LIBER ✦

Determination of amphetamine and methamphetamine in urine with sodium 1,2-naphthoquinone 4-sulphonate using the H-point standard addition method

✍ Scribed by Pilar Campíns Falcó; Francisco Bosch Reig; Adela Sevillano Cabeza; Carmen Molins Legua

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 677 KB
Volume: 287
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(94)85099-2

No coin nor oath required. For personal study only.

✦ Synopsis

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 the extraction solvent is proposed. The analytes are previously extracted into n-hexane. Although their spectra are very similar and overlap, the H-point standard additions method provides good results for both amines. The applicability of the method when the total Youden blank is present is demonstrated. The relative errors found were less than 10%.

📜 SIMILAR VOLUMES

Extractive-spectrophotometric determinat

Extractive-spectrophotometric determination of amphetamine in urine samples with sodium 1,2-naphthoquinone 4-sulphonate

✍ Carmen Molins Legua; Pilar Campíns Falcó; Adela Sevillano Cabeza 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 732 KB

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

Determination of theophylline and paraxa

Determination of theophylline and paraxanthine in urine samples by liquid chromatography using the H-point standard additions method

✍ Pilar Campíns-Falcó; Francisco Bosch-Reig; Rosa Herráez-Hernández; Adela Sevilla 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 631 KB

The simultaneous determmatlon of theophylhne and paraxanthme m urine samples by the H-pomt standard additions method (HPSAM) IS described Samples are extracted with Cl, solid-phase extraction cartndges and chromatographed using a Hypersd Cl,-ODS column and a mobile phase conslstmg of acetomtnle-phos

Determination of energy minima and saddl

Determination of energy minima and saddle points using multireference configuration interaction methods in combination with reduced gradient following: The S0 surface of H2CO and the T1 and T2 surfaces of acetylene

✍ Michal Dallos; Hans Lischka; Elizete Ventura Do Monte; Michael Hirsch; Wolfgang 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 120 KB

The implementation of the reduced gradient following (RGF) method into the COLUMBUS quantum-chemical program system is reported using the newly developed analytic MR-CISD/AQCC gradient feature. By this combination a very useful tool has been developed for general searches of stationary points on gro