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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 223.37-2020 |
Iron, steel and alloy—Determination of nitrogen content—indophenol blue spectrophotometric method after distillation separation 钢铁及合金 氮含量的测定 蒸馏分离靛酚蓝分光光度法 |
China National Standards indophenol |
 English PDF |
| GB/T 223.37-1989 |
Methods for chemical analysis of iron，steel and alloy--The indophenol blue photometric method for the determination of nitrogen content after distillation separation 钢铁及合金化学分析方法 蒸馏分离-靛酚蓝光度法测定氮量 |
China National Standards indophenol |
English PDF |
| GB/T 6195-1986 |
Determination of vitamin C in vegetables and fruits(2，6-dichloro indophenoltitration method) 水果、蔬菜维生素C含量测定法 (2，6-二氯靛酚滴定法) |
China National Standards indophenol |
English PDF |
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