美国CHEMetrics K-3903型DEHA测试盒
用于测试水中DEHA含量。例如：锅炉给水和冷凝水。该***盒需要使用CHEMetrics直读光度计（多参数水质分析仪：V-2000/V-3000或13mm圆形比色皿的分光光度计。
规格参数：
| 产品类型 | DEHA — Vacu-vials® Instrumental Kit |
| 产品型号 | K-3903 |
| 测试范围 | 0-2.00 ppm |
| 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 | 30支安瓿瓶、1瓶活化剂溶液、1个25mL样品杯、1支空白安瓿瓶、1份说明书 |
Vacu-vials® 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.