漂白粉作为鱼塘杀菌消毒剂,具有杀菌力强、药效消失快、不污染水质、价格便宜、使用方便等优点,倍受广大养鱼户亲睐。但近年来,由于市场上销售的漂白粉含氯量不稳(大都低于30％),有的甚至以假混真(拌石灰等)或受潮变质,故在防治鱼病中以常用药量很难见效,使不少养鱼户吃了苦头。对此,很多农户渴望找到鉴别优劣漂白粉的技术,现简介几种方法如下,供参考: 一、直观与嗅法:正常而含氯量高的漂白粉为灰白色粉末,干燥,有较强的氯臭和盐味,且吸潮性能强,遇水稀释产热剧烈。劣质漂白粉嗅之氯臭和盐味较淡,吸潮性能差,直观颜色不一,或潮湿结块,遏水后产热较弱。二、蓝黑墨水测量法测定漂白粉的有效含氯量,具体方法及步骤是: 1.材料准备:选用未渗水和无沉淀的国产蓝黑墨水若干(大桥牌,英雄牌、北京牌等), Bleaching powder as a fish pond disinfectant, with strong bactericidal power, efficacy disappears quickly, does not pollute the water, cheap, easy to use, etc., much the majority of fish farmers pro-Lai. However, in recent years, due to the volatile chlorine content of bleaching powder on the market (mostly less than 30%), and some even fake mixed (lime, etc.) or damp deterioration, so in the prevention and treatment of fish disease in the commonly used dose is very Difficult to bear fruit, so many fish farmers suffered. In this regard, many farmers are eager to find good and bad bleaching technology, is now introduced several methods are as follows for reference: First, the visual and smell method: normal and high chlorine bleach is gray powder, dry, strong chlorine Smelly and salty, and strong moisture absorption, diluted with water heat of production. Poor quality bleach odor smell of chlorine and salty lighter, hygroscopic poor performance, visual color varies, or humid agglomeration, contain water after weak heat. Second, the blue black ink measurement of bleach effective chlorine content, the specific methods and steps are: 1. Material Preparation: Selection of non-seepage and no precipitation of a number of domestic blue-black ink (Bridge, Heroes, Beijing, etc.)