Closed-vessel Digestion for Cosmetics - 4 Pages

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Closed-vessel Digestion for Cosmetics

Catalog excerpts

Anton PaarClosed-vessel Digestion of CosmeticsNational and International regulations control concentrations of heavy metals in cosmetics. The goal is to avoid intoxication following regular use of products like lipsticks, nail varnish or toothpaste. certification. The same situation is found in the U.S. and within the EU, where official labs only control the compliance of products on the market. In the U.S., ingredients are controlled by the Cosmetic Ingredient Review (CIR) Expert Panel. In the EU, the Scientific Committee on Consumer Products (SCCP) is the responsible institution. Within the EU, analysis for different toxic or critical compounds is regulated using standardized directives including sample preparation methods, e.g.: ■ 83/514/EEC Determination of Hg after closed vessel mineralization ■ 93/73/EEC Determination of Se after closed vessel mineralization Table 1: Regulations for Cosmetics In 2001 a notification for new cosmetic products on the Japanese market replaced the previously needed Multiwave PRO with Rotor 8N is the perfect system to cope with this challenge: highest digestion temperature for complete mineralization, extreme high-pressure stability, and permanent monitoring of the reaction conditions on all vessel positions. To ensure total destruction of all inert inorganic materials, high temperatures - sometimes for up to one hour digestion time or longer - are needed. Furthermore, total digestion of many cosmetic products requires the use of hydrofluoric acid. 1.1 Regulations and Standard Methods Before distributing cosmetics in a regional market it is necessary to comply with the local regulations. Table 1 lists the most important regulations The ASEAN region regulates trace metal content analysis including microwave closed-vessel sample preparation by the directive ACM THA 05. In the US and Japan regulations include only concentration limits or lists of banned substances without suggesting detailed analytical processes. In such a case the samples need to be prepared and analyzed according to officially recognized methods and GLP regulations. Closed-vessel acid digestion can be used bringing all advantages known for, but it is not obligatory due to official regulations. 1.2 Challenges and Requirements in Sample Decomposition When using closed-vessel digestion, the user must keep in mind the difficult combination of the listed inert materials, like pigments, with very reactive compounds, such as oils or fats, in many of the samples bears a real challenge. Digesting these mixtures requires a high-performance system, which can achieve the required high temperature for complete digestion, but can also manage the high pressure build-up produced by the organic compounds during the digestion procedure. In addition, fats and oils tend to react spontaneously, requiring a permanent monitoring and control of the reaction conditions to avoid vessel failure and sample loss.

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Multiwave PRO with Rotor 8N is the perfect system to cope with this challenge:  highest digestion temperature for complete mineralization,  extreme high-pressure stability,  and permanent monitoring of the reaction conditions on all vessel positions. To ensure total destruction of all inert inorganic materials, high temperatures – sometimes for up to one hour digestion time or longer – are needed. Furthermore, total digestion of many cosmetic products requires the use of hydrofluoric acid Figure 1: Multiwave PRO with Rotor 8NXQ80 Good to know: Many labs refuse the usage of hydrofluoric...

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3 Multiwave PRO Applications for Cosmetics Table 2 below shows some tested digestion methods for cosmetic-related samples using one of the above mentioned rotors. a...Complexation is necessary b...Temperature programs are independent from the number of vessels

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Anton Paar 4 Discussion It has been shown that the closed-vessel microwave technique does provide perfect solutions for both industrial and public testing labs in the field of consumer protection. The possibility of using solid fluorides allows for complete dissolution of inorganic components without the hassle of handling concentrated hydrofluoric acid. The availability of both quartz and PTFE-TFM vessels for Multiwave PRO makes it suitable for both total digestion and acid leaching applications. Contact Anton Paar GmbH Tel: +43 316 257-0 asc@anton-paar.com | www.anton-paar.com

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