| 摘要 |
1,134,572. Nitrite determination in phosphatizing solutions. AMCHEM PRODUCTS Inc. 25 July, 1967 [25 July, 1966], No. 34146/67. Heading B1X. [Also in Division C7U] Solid sulphamic acid is used for measuring the concentration of nitrite in an aqueous acidic nitrite/chlorate accelerated phosphatizing solution by mixing the sulphamic acid with a sample of the phosphatizing solution, and collecting and measuring the nitrogen gas thereby evolved. |
