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最近,对干式灰化阳极溶出伏安法测定食品中铅和镉进行了协作研究。用硫酸作助灰剂,在干燥和灰化时,常使样品溅起,而且长期使用硫酸灰化,马福炉很快被腐蚀。作者用10 g硫酸钾溶于100 ml 2%(v/v)硝酸溶液中做助灰剂,结果满意。灰化时间缩短,炉温稍高也无妨。由于不需要煮沸驱赶硫酸,可更迅速地使炉温升至预定的最高度。灰化后进行阳极溶出伏安法测定。方法简介:所用玻璃器皿及塑料器皿均于20%(v/v)硝酸中浸泡24小时以上,然后用蒸馏水、去离子水清洗。由于实验室的污染控制
Recently, dry ashing anodic stripping voltammetry for the determination of lead and cadmium in food has been collaboratively studied. Sulfuric acid as an aid agent, in the drying and ashing, often splashes the sample, but long-term use of sulfuric acid ash, muffle furnace corrosion soon. The author used 10 g of potassium sulfate dissolved in 100 ml of 2% (v / v) nitric acid solution to make a gray agent, with satisfactory results. Ashing time is shortened, the temperature is slightly higher anyway. Since it is not necessary to boil off sulfuric acid, the furnace temperature can be raised more quickly to a predetermined maximum level. Ashing after anodic stripping voltammetry. Method Description: The glassware and plastic containers used were soaked in 20% (v / v) nitric acid for more than 24 hours, then washed with distilled water, deionized water. Due to laboratory pollution control