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Synthesis of hydrochloric acid solution for total mercury determination in natural waters ArchiMer
Patel-sorrentino, Nathalie; Benaim, Jean-yves; Cossa, Daniel; Lucas, Yves.
Total mercury (Hg-T) determination requires the addition of concentrated hydrochloric acid solution (>= 10 mol L-1 HCl) in relatively high amounts to preserve the samples and to prepare reagent solutions. A method for the preparation of concentrated HCl with HgT concentration of lower than 5 ng L-1 is described in this article. It is based on the well-known chemical reaction: 2 NH4Cl+H2SO4 ->(NH4)(2)SO4+2 HCl. This method is validated thanks to the US Environmental Protection Agency method 1631 and standard reference materials BCR-579 (mercury in coastal seawater).
Tipo: Text Palavras-chave: Synthesis; Hydrochloric acid; Mercury determination; Green analytical chemistry.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00029/14071/11390.pdf
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Development and validation of dissolution method for carvedilol compression-coated tablets BJPS
Shah,Ritesh; Patel,Sachin; Patel,Hetal; Pandey,Sonia; Shah,Shailesh; Shah,Dinesh.
The present study describes the development and validation of a dissolution method for carvedilol compression-coated tablets. Dissolution test was performed using a TDT-06T dissolution apparatus. Based on the physiological conditions of the body, 0.1N hydrochloric acid was used as dissolution medium and release was monitored for 2 hours to verify the immediate release pattern of the drug in acidic pH, followed by pH 6.8 in citric-phosphate buffer for 22 hours, to simulate a sustained release pattern in the intestine. Influences of rotation speed and surfactant concentration in medium were evaluated. Samples were analysed by validated UV visible spectrophotometric method at 286 nm. 1% sodium lauryl sulphate (SLS) was found to be optimum for improving...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carvedilol/coated tablets; Compression coated tablets/dissolution; PH 6.8 citric-phosphate buffer; Hydrochloric acid; Sodium lauryl sulphate.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502011000400027
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