GB/T 223.6-1994 Methods for chemical analysis of iron,steel and alloy The neutralization titrimetric method for the determination of boron content (English Version)
This standard specifies a neutralization titrimetric method for the determination of boron content.
This standard is applicable to the determination of the boron content in high-boron stainless steels. Boron determination range: 0.50%~2.00%.
2 Principle
Dissolution of the sample with hydrochloric acid. Separation of elements such as ferrum, chromium and nickel. Using mononitrophenol as an indicator, regulation of the solution to acidic. Decarbonation by boiling. Re-regulation of the solution to pH 7. With the presence of mannite, using phenolphthalein as an indicator, titration with sodium hydroxide standard solution.
A tungsten content larger than 15 mg and a molybdenum content larger than 15 mg both interfere the determination.
GB/T 223.6-1994 Methods for chemical analysis of iron,steel and alloy The neutralization titrimetric method for the determination of boron content (English Version)
Standard No.
GB/T 223.6-1994
Status
valid
Language
English
File Format
PDF
Word Count
2000 words
Price(USD)
110.0
Implemented on
1995-6-1
Delivery
via email in 1 business day
Detail of GB/T 223.6-1994
Standard No.
GB/T 223.6-1994
English Name
Methods for chemical analysis of iron,steel and alloy The neutralization titrimetric method for the determination of boron content
1 Subject and Applicability
This standard specifies a neutralization titrimetric method for the determination of boron content.
This standard is applicable to the determination of the boron content in high-boron stainless steels. Boron determination range: 0.50%~2.00%.
2 Principle
Dissolution of the sample with hydrochloric acid. Separation of elements such as ferrum, chromium and nickel. Using mononitrophenol as an indicator, regulation of the solution to acidic. Decarbonation by boiling. Re-regulation of the solution to pH 7. With the presence of mannite, using phenolphthalein as an indicator, titration with sodium hydroxide standard solution.
A tungsten content larger than 15 mg and a molybdenum content larger than 15 mg both interfere the determination.
