Carbohydrazide CHEMets Kit Catalog No. K-1805 Range: 0-0.50 & 0.50-4.0 ppm MDL: 0.05 ppm Method: PDTS Shelf life: The C-1810 comparator contained in this kit has a shelf-life of 12 months.
Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Comparator, Activator Solution, 25 mL sample cup, and instructions.
CHEMets® for Visual Colorimetric Analysis
測試步驟:
Visual Kits
Range
MDL
Method
Kit Catalog No.
Refill Catalog No.
0-0.50 & 0.50-4.0 ppm
0.05 ppm
PDTS
K-1805
R-1805
Instrumental Kits
Range
Method
Kit Catalog No.
0.10-2.50 ppm
PDTS
K-1803
Method
Carbohydrazide is added to boiler system water as an oxygen scavenger to control corrosion. It is a safer alternative to hydrazine, which is toxic. Carbohydrazide reacts with oxygen at low temperatures and pressures. The products of the reaction are volatile and do not contribute dissolved solids to the boiler water. Like hydrazine, carbohydrazide will also passivate metal surfaces.
The PDTS Method
Reference: G. Frederick Smith Chemical Co., The Iron Reagents, 3rd ed., p. 47 (1980).The test kits employ the PDTS chemistry. Carbohydrazide reduces ferric iron to the ferrous state, and the ferrous iron reacts with PDTS (3-(2-pyridyl)-5,6-bis(4-phenylsulfonic acid)-1,2,4-triazine disodium salt) to form a peach-pink colored complex in direct proportion to the carbohydrazide concentration. Test results are expressed as ppm (mg/L) carbohydrazide. 美國CHEMetrics中國代理商:上海益朗儀器有限公司。