BS ISO 7086-1:2019 pdf free
BS ISO 7086-1:2019 pdf free.Glass hollowware in contact with food一Release of lead and cadmium
Samples of ware shall be clean and free from grease or other matter likely to affect the test. Briefly wash the specimens in an aqueous solution at (40±5) °C at hand-hot temperature using tap water containing 1 ml/l of a non-acidic domestic detergent. Rinse in tap water and then in water (5.1.1). Drain and dry either at a temperature of (40±5)°C in a drying oven or by wiping with a new piece of filter paper. Do not use any sample that shows residual staining. Do not handle the surfaces to be tested after cleaning.
Prior to sampling, mix the extraction solution by stirring or another appropriate method that avoids loss of the extraction solution or abrasion of the surface. Remove the amount of the extraction solution required by the considered analytical method with a pipette and transfer it to a suitable storage container.
Analyse the extraction solution as soon as possible since there is a risk of adsorption of lead or cadmium on to the walls of the storage container, particularly when Pb and Cd are present in low concentrations.
The drinking rims of glass hollowware shall be tested by marking each of four units (20±1) mm below the rim on the outside. Each item is placed inverted in a suitable laboratory glassware container with a diameter between 1,25 and 2 times that of the item. Add sufficient test solution (5.1.3) to the glassware container to fill to the 20 mm mark on the item. Leave to stand for (24±0,5) h, or (2±0,1) h depending on the considered case, at (22±2) °C (in the dark for cadmium determinations) and protect from excessive evaporation. Carefully cover the portion of the external surface of the article that is not to be tested with melted paraffin wax. Cover any handle present in the drinking rim region to be tested in the same way.BS ISO 7086-1 pdf free download.
