This standard applies to the determination of lead in gallium. Measuring range: 0.0010~0.030%.
GB/T 4375.2-1984 history
1984GB/T 4375.2-1984 Methods for chemical analysis of gallium--The 4-(2-pyridylazo)-resorcinol photometric method for the determination of lead content
GB/T 4375.2-1984 was changed to YS/T 520.2-2006 Gallium Chemical Analysis Method 4-(2-Pyridylazo)-Resorcinol Spectrophotometric Determination of Lead Content.