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我们在DDTC分离、偶氮胂Ⅲ比色法测定稀土总量和DDTC分离、EBT比色法测定镁的基础上,试验了球铁中稀土总量和镁的联合比色测定方法。将高氯酸、乙酸及DDTC三者之间的用量,互相配合好,经过滤后,不必进行调节手续来测定稀土总量和镁。本法在第一次加DDTC沉淀分离铁等干扰元素后的pH值约在4～4.5。吸出部分溶液来测定稀
The DDTC separation, arsenazo Ⅲ colorimetric determination of total rare earths and DDTC separation, EBT colorimetric determination of magnesium, based on the test of the total amount of rare earth in ductile iron and magnesium combined colorimetric determination. Perchloric acid, acetic acid and DDTC the amount of the three, cooperate well, after filtration, without the need to adjust the total amount of rare earth and magnesium. This method in the first plus DDTC precipitation separation of iron and other interfering elements after the pH value of about 4 ~ 4.5. Aspirated part of the solution to measure the dilute