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在含有大量钨、钛、钼、铬、镍等元素的合金中测定铌,如果用重量法则手续繁琐,费时较长。硫氰酸盐,88-羟基喹啉,铌钼兰,二甲苯酚橙等比色法和分光光度法,其方法本身是较快速和简单的,但须将铌从试样中分离,然后再经萃取等手续进行比色测定,并受温度、酸度、试剂、浓度的影响,而且有色络合物稳定性较差。 Belcher提出PAR(pyridine-(2-azo-4)-Resorcinal)和铌在pH5.8～6.4范围内,EDTA存在下生成一红色络合物,可用于铌的比色测定。铌量在0—70微克符合比尔定律。Елинон用于Ti-Nb,Zr-Nb二元合金中0.3—1％铌的测定,得到了满意的结果。本工作对测定含有多种合金元素钢中的铌(0.3～5％)进行了试验。
The determination of niobium in alloys containing a large amount of tungsten, titanium, molybdenum, chromium, nickel and other elements takes time and is laborious if the weight method is used. Thiocyanate, 88-hydroxyquinoline, molybdenum niobium, xylenol orange and other colorimetry and spectrophotometry, the method itself is faster and easier, but the niobium from the sample to be separated, and then After extraction and other procedures for colorimetric determination, and the temperature, acidity, reagents, concentrations, and the poor stability of colored complexes. Belcher proposed that pyridine (2- (azo-4) -Resorcinal) and niobium should be used in the colorimetric determination of niobium in the presence of EDTA at pH5.8 ~ 6.4. The amount of niobium in the 0-70 microgram complies with Bill’s law. Елинон for Ti-Nb, Zr-Nb binary alloy 0.3-1% niobium determination, and obtained satisfactory results. This work has been tested on niobium (0.3 ~ 5%) containing various alloying elements.