邻菲罗啉比色法测定微量铁,要求在介质pH值为2～5的条件下进行显色反应。国标GB534—82是先将工业硫酸试样蒸干,其残渣溶解在2毫升浓HCl中,然后移入100毫升容量瓶内,并稀释至刻度,用这样的方法来维持显色反应所需的pH值,用于测定铁。我们采用中和的方法,省去蒸干操作,同时为了强化盐酸羟胺还原Fe~(3+)的条件,将颜色反应在沸腾水浴上煮沸15～20分 Phenanthroline colorimetric determination of trace iron, requiring medium pH value of 2 ~ 5 under the conditions of color reaction. National standard GB534-82 is the first industrial sulfuric acid sample evaporated to dryness, the residue dissolved in 2 ml of concentrated HCl, and then transferred to 100 ml volumetric flask and diluted to the mark, in such a way to maintain the pH of the color reaction Value for the determination of iron. We use the method of neutralization, eliminating the need for steam-drying operation, and in order to strengthen the hydroxylamine hydrochloride to reduce Fe ~ (3+) conditions, the color reaction in a boiling water bath to boil 15 to 20 minutes