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5.镁的测定栽培蘑菇每100克干重约含150毫克0.15％)的镁。镁可用原子吸收法(A.O.A.C,2.112和3.007,1980)测定。仪器:原子吸收分光计试剂:镁标准液:(i)贮备液——1000ppm镁。置1.000克纯金属镁于50毫升蒸馏水中,缓缓加入10毫升分析纯浓盐酸,定容至1升。(ii)标准工作液——0,0.1,0.2,0.3,0.4,0.5μgMg/ml。取10毫升贮备液稀释至1升(10ppm Mg)。取0,1,2,3,
5. Determination of Magnesium Mushrooms contain approximately 150 mg (0.15%) magnesium per 100 g dry weight. Magnesium can be determined by the atomic absorption method (A.O.A.C, 2.112 and 3.007, 1980). Apparatus: Atomic Absorption Spectrometer Reagents: Magnesium Standard Solution: (i) Stock Solution - 1000 ppm Magnesium. Set 1.000 grams of pure metal magnesium in 50 ml of distilled water and slowly add 10 ml of analytically pure concentrated hydrochloric acid to a volume of 1 liter. (ii) Standard working solution - 0, 0.1, 0.2, 0.3, 0.4, 0.5 μg Mg/ml. Dilute 10 ml stock solution to 1 liter (10 ppm Mg). Take 0,1,2,3,