美国CHEMetrics R-3902型DEHA填充盒
用于测试水中DEHA含量。例如：锅炉给水和冷凝水
是使用K-3902型DEHA测试盒中的补充品。
规格参数：
| 产品类型 | DEHA — CHEMets® Refill |
| 产品型号 | R-3902 |
| 测试方法 | PDTS |
| 测试次数 | 30次/盒 |
| 产品价格 | 咨询上海益朗仪器有限公司 |
| 辅助器具 | C-3901型低范围DEHA比色筒、C-3902型高范围DEHA比色板、A-3900型DEHA活化剂溶液、A-0023型25mL样品杯 |
CHEMets®是美国CHEMetrics的专利（专利号：3,634,038）。
美国CHEMetrics DEHA测试盒
Visual Kits
| 测试范围 | MDL | 测试方法 | 测试盒货号 | 填充盒货号 |
| 0-400 & 400-3000 ppb | 15 ppb | PDTS | K-3902 | R-3902 |
| 25-250 ppm | 25 ppm | Ceric Sulfate Titrant with Ferroin Indicator | K-3925 |
Instrumental Kits
| 测试范围 | 测试方法 | 测试盒目录 |
| 0-2.00 ppm | PDTS | K-3903 |
Methods
Dissolved oxygen in boiler system water causes corrosion and pitting of metal surfaces, which can lead to boiler inefficiency, equipment failure, and system downtime. DEHA (N,N- Diethylhydroxylamine) is added to boiler system water as an oxygen sc***enger to keep the dissolved oxygen levels as low as possible.
The PDTS Method
Reference: G. Frederick ***ith Chemical Co., The Iron Reagents, 3rd ed., p. 47 (1980).
The test kits employ the PDTS chemistry, in which DEHA reduces iron III (ferric state) to iron II (ferrous state), which readily reacts with PDTS (3-(2-pyridyl)-5,6-bis(4-phenylsulfonic acid)-1,2,4-triazine disodium salt) to form a pink-purple colored complex in direct proportion to the DEHA concentration. Test results are expressed in ppb (ug/L) or ppm (mg/L) DEHA.
The Ceric Sulfate Titrimetric Method
Reference: Developed by CHEMetrics, Inc.
CHEMetrics developed a titrimetric method that employs a ceric sulfate titrant and ferroin end point indicator. DEHA reduces ferric iron to the ferrous state, and the resulting ferrous iron is titrated with the ceric sulfate titrant. Test results are expressed in ppm (mg/L) DEHA.
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