Determining Chromium(VI) in Toys
News Mar 10, 2014
Children are exposed to intakes of heavy metals from a wide variety of sources. Chromium (VI) in particular represents a potential hazard, as it is absorbed from food and drinking water, from the air that is breathed, from textiles, from utensils that contain metal and from toys. The analytical determination of chromium (VI) content in toys for compliance with limit values is described in the European standard DIN EN-71-3-2013 (Safety of toys Part 3 – Migration of certain elements).
The standard differentiates between three categories, depending on the kind of toys:
Category I – migration limit: 0.02 mg/kg of Cr(VI)
- Dry, brittle, powder-like or soft toy materials e.g., leads of pencil crayons, chalk, wax crayons
Category II – migration limit: 0.005 mg/kg of Cr(VI)
- Liquid or sticky toy materials, finger paints, liquid ink or soap solutions
- Scraped-off toy materials: coats of paint, printing inks, decorative paints,
- Paper and cardboard, glass, ceramics, metallic materials, uncoloured and colored materials, e.g., wood and leather
Metrohm has developed an ion chromatography method for this application using preconcentration and Inline Matrix Elimination.
A portion of the migration solution produced in accordance with the regulation DIN EN 71-3:2013-07 is placed on a preconcentration column where a rinsing solution is used to elute the matrix from the column. In the second step, chromatographic separation takes place on an anion exchanger. Detection is accomplished using a very specific post-column derivatization in combination with UV/VIS detection.
Chemical Topology of Silica Influences its EffectivenessNews
Researchers find that the chemical topology of silica can influence the effectiveness of many chemical processes that use it. Silica is a versatile material used in myriad industrial processes, from catalysis and filtration, to chromatography and nanofabrication.READ MORE
'Royal' Pheromone Identified in TermitesNews
Researchers have for the first time identified a specific chemical used by the higher termite castes – the queens and the kings – to communicate their royal status with worker termites. The findings could advance knowledge of termite evolution, behavior and control.READ MORE
Making Fragrances Last LongerNews
From floral perfume to fruity body wash and shampoos, scents heavily influence consumer purchases. But for most, the smell doesn’t last long after showering before it fades away. Scientists have now developed a way to get those fragrances to stick to the skin longer instead of washing down the drain immediately after being applied.READ MORE
Comments | 0 ADD COMMENT
11th International Conference and Exhibition on Metabolomics & Systems Biology
May 17 - May 19, 2018