Division 4 Reagents and materialsF1

During the analysis, use only reagents of a purity of at least 98 %. Water of at least grade 3 as defined by ISO 3696 should be used.

Reference chemicals should be stored cold (at 4 ^o C), away from light, in aluminium containers or in tinted (amber) glass reagent bottles. The stoppers should preferably be fitted with an aluminium seal. Trans-anethole will need to be ‘thawed’ from its crystalline state before use, but in this case its temperature should never exceed 35 ^o C.