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在硅酸盐材料的全分析中,对铁含量较低的样品,如石灰石、白水泥、砂岩、长石、矾土水泥等,选用比色法测定铁的含量,具有准确、快速的特点,常见的比色方法有磺基水杨酸法、硫氰酸盐法、邻菲罗啉法等。磺基水杨酸法体系稳定性好,但灵敏度低;硫氰酸盐法的灵敏度稍优于磺基水杨酸法次于邻菲罗啉法,但体系稳定性较差,邻菲罗啉法的显色剂不稳定,需经常配制,比较麻烦。近几年来,人们也发现和合成了许多灵敏度较高的测铁的新显色剂,如:
In the full analysis of silicate materials, the method of colorimetric determination of iron content for samples with lower iron content, such as limestone, white cement, sandstone, feldspar and alumina cement, is accurate and rapid. Common colorimetric methods are sulfosalicylic acid method, thiocyanate method, o-phenanthroline method. Sulfosalicylic acid method has good stability, but its sensitivity is low. The sensitivity of thiocyanate method is slightly better than that of sulfosalicylic acid method in the phenanthroline method, but its stability is poor. Phenanthroline Color reagent instability, the need for regular preparation, more trouble. In recent years, many people also found and synthesized a number of new high sensitivity test iron reagent, such as: