【摘要】 在酸性条件下，以联氨与对二甲基胺苯甲醛反应，生成在 ４５８ｎｍ处有强吸收的物质，从而建立了联氨的连续流动和停流自动在线监测方法。连续流动可用于联氨的在线实时监测，而停流方法可用于其他情况。用一蓝光二极管代替通常的光源，在低显色剂浓度和低流速的实验条件下，其自动在线监测的吸光度与联氨浓度在 ５～１０００ μｇ· Ｌ－１范围内呈良好的线性关系，检出下限为 ２μｇ· Ｌ－１。更多还原

【Abstract】 Hydrazine reacts with 4-dimethylaminobenzaldehyde in acidic condition to give a compound which is characterized by a absorbency maximum 458 um. The automatic system of continuous flow and stop flow for monitoring hydrazine in boiler feed water of power plants was investigated. Continuous flow system was used for real time monitoring of hydrazine and the stop flow system was used for other case. A blue color diode was used to take place of normal light source. The detection limit is 2 pg/I., and the linear range of monitoring is 5 -1000 /L. The system not only used to automate on-line monitoring hydrazine in boiler feed water of power plants but also can be used to control the adding quantity of hydrazine.更多还原