A Simple Procedure for Decomposition of Human Hair Using Polypropylene Vials for Selenium Determination by Hydride Generation Atomic Absorption Spectrometry

Atomic spectrometry update. Clinical and biological materials, foods and beverages

“…33 Samples were treated with 4 M HNO 3 at 55 1C and recoveries of added (CH 3 Hg 1 ) enriched with 201 Hg were 93-96%. An attractively simple process was used by Mortari et al 34 to prepare hair samples for the measurement of Se by HGAAS. Sample, and either HNO 3 -H 2 O 2 or H 2 SO 4 -HNO 3 , in small, disposable polypropylene vials, were heated at 100 1C for 20 h. Sulfamic acid was added to minimise the influence of residual NO x and results for a CRM were within 3% of the certified value.…”

Atomic spectrometry update. Advances in atomic emission, absorption and fluorescence spectrometry, and related techniques

“…The Se concentrations in various types of milk were between 8.5 and 21 mg l À1 , with the highest concentrations in whey (47.2-73.6%), and the lowest in the fat phase (4.8-16.2%). Mortari et al developed a decomposition procedure 188 for the determination of Se in human hair by HG-AAS based on prolonged (20 h) heating at 100 1C in a mixture of nitric and sulfuric acids, or nitric acid and peroxide. They added sulfamic acid to minimize the interference due to residual nitrogen oxides and achieved an LOD of 120 mg kg À1 .…”

New Design of Mini PTFE Vessels for Sample Preparation in Micro Scale: Determination of Cd, K, Mg and Na in Biological Sample

“…passing the main problem of conventional decomposition methods, which use substantial amounts of both sample and reagents, interfering directly with the cost of analysis and waste generation. [14][15][16][17][18] A great number of these studies was performed in centrifugation micro tubes made of polypropylene, which limits time and temperature decomposition. Consequently, a micro tube deformation and rupture occurs, affecting the efficiency and repeatability of the procedure.…”