硫酸铁铵分子量为482,铁为56
所以0.6120g硫酸铁铵中含铁0.071g,即71mg
定容到500mL,铁浓度为0.142mg/mL
所以2mL、4mL、6mL、8mL、10mL标液中含铁分别为0.284mg,0.568mg,0.852mg,1.136mg,1.42mg
根据表格画出标准曲线(如图),吸光度与铁含量的方程为y=0.5912x
代入y=0.555,算出2mL样品稀释液中含铁量约为0.939mg
所以250mL稀释液中含铁0.939*250/2=117.375mg
即5mL样品中含铁117.375mg
样品中铁含量约为117.375/5=23.48mg/mL
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