基于NO_2--显色反应的抗湿性喷雾雾滴密度和大小的检测体系  

Humidity resistance test system for spray droplet density and size based on NO_2^- color reaction

作　　者：郑琦琦[1] 吴坚[1] 

机构地区：[1]浙江大学生物系统工程与食品科学学院,杭州310058

出　　处：《农业工程学报》2015年第3期107-112,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：江苏省现代农业装备与技术协同创新中心项目“农产品安全信息的智能感知技术与装备”(NZXT01201402)

摘　　要：喷雾质量在一定程度上影响着"农药有效利用率"。喷雾雾滴密度和大小是影响喷雾质量的2个重要参数。针对目前应用最多的喷雾雾滴测量方法——水敏纸法,水敏纸存在抗湿性能差的缺点,该研究在保证原有使用性能的同时,设计制作一种适合在潮湿环境中使用的喷雾雾滴密度和大小的检测体系。该检测体系由检测卡和检测液两部分组成。检测液中含有能与检测卡反应的NO2-,综合考虑安全性和检测卡使用性能,检测液中Na NO2浓度应尽量接近但不能超过150 mg/L,该文下述试验采用Na NO2质量浓度125 mg/L。研究对检测卡的扩散均匀性和不同卡之间的平行性进行了探究,结果显示在同一检测卡上的相对标准偏差小于等于5.37%,在随机3张检测卡之间的相对标准偏差小于等于12.66%,结果表明该检测卡的均匀性和平行性较好;雾滴实际直径与斑点直径的拟合方程对于该方法制作的检测卡检测雾滴大小时具有较好的通用性;并与市售水敏纸进行检测准确性比较,结果显示在3种不同喷雾压力下,该检测卡检测结果与水敏纸基本相同,且与市售水敏纸同时进行抗湿性检验,结果显示本检测系统的检测卡具有较好的抗湿性能。因此,该文设计的喷雾雾滴密度和大小的检测体系在干燥与潮湿环境中均能良好使用。Agriculture sprayer is widely used in plant protecting. There are many factors affecting the effective utilization of pesticide, such as canopy structure, meteorological condition, machine performance. The quality of spray will also affect the effective utilization of pesticide to some extent. Spray droplet density and spray droplet size are two important parameters which will affect the quality of spray. There are many methods of detecting spray droplet density and spray droplet size, and water sensitive paper is the most frequently-used one for its simpleness, convenience and sensitiveness. However, water sensitive paper has its own disadvantage that it can＇t be used in wet environment. Hence, a detection system is invented to test spray droplet density and spray droplet size in both dry and wet environments. The detection system consists of the test card and tracer liquid. The test card is composed of starch, calcium sulfate, sulfanilamide, tartaric acid, N-（1-naphthyl） ethylenediamine dihydrochloride and deionized water. These materials become a film on the quantitative filter paper. The surface of test card is white and smooth when it is unused. Tracer liquid contains NO-2, which can react with test cards. When tracer liquid is used to spray the test card, aubergine spots will be generated on it. The information of spray droplet will be recorded on the test card. A series of solutions with different NaN O2 concentrations（0, 7.8, 15.6, 31.3, 62.5, 125, 250 mg/L） are prepared to choose a better concentration. The higher the concentration is, the deeper spots＇ color shows. The China national standard of food additives（GB2760-2011） indicates that the largest amount of NaN O2 is 150 mg/kg. Considering the food safety and detection sensitivity, the concentration should be close to 150 mg/L but not exceed this value. In the research, 125 mg/L mass concentration of NaN O2 is chosen. Before detecting the spray droplet size, a D2-D1 curve should be drawn, and D2 is the actual diameter of droplet and D1

关 键 词：农药 喷雾 密度 雾滴密度 雾滴大小 检测卡 检测液 

分 类 号：S49[农业科学—植物保护]