利用EDTA络合法连续测定钙、镁和连续测定铁、铝(钛)的资料颇多,但是迄今为止尚未见到有连续络合测定钙、镁、铝、铁的方法。资料介绍利用氟化铵和碳酸钾(或氟化氢钾)在PH5—5.5沉淀铁(Ⅲ)为六氟铁酸钾(K_3FeF_6)以掩蔽铁,然后可作铜、铅、镍、钴、锌和镉等元素的间接络合滴定。据此,我们通过 Continuous determination of calcium and magnesium by EDTA complexing method and continuous determination of iron and aluminum (titanium) are quite numerous, but so far there is no method of continuous complex determination of calcium, magnesium, aluminum and iron. Data Sheet The use of ammonium fluoride and potassium carbonate (or potassium hydrogen fluoride) to precipitate iron (Ⅲ) at pH 5.5-5 as potassium hexafluoride (K_3FeF_6) to mask the iron and then make copper, lead, nickel, cobalt, zinc and cadmium And other elements of indirect complexometric titration. Based on this, we passed