Fluorescent tracers are frequently used in spray tests, but their stability under illumination and rate of elution and recovery from the deposition carrier are crucial to the accuracy of the test results. Spectral analysis has shown that the absorbing wavelengths for RhB and BSF are 573.8 nm and 494.6 nm, respectively, at most under uninterrupted sunlight and their recovery rates are 93.5%–98.2% and 95.5%–99.4%, respectively. In favourable light stability, a great part of both colouring agents can be eluted and recovered from glass slides and mylar card but not so much from filter paper. Because of the tracers being influenced by light, when using a mylar card as a receiver, different coloured plastic boards were used as pads, and it was found that a red pad can increase the recovery of elution by three percent in 2 hours. Our goal was to determine which chemicals would be most suited for use as tracers for the simulation of long-distance transport of pesticides in aerial spraying by evaluating the effects of spraying pattern on spraying deposition and drift potential of pesticide sprays. Tests undertaken on a farm showed that the two colouring agents studied can be effectively used as tracers to investigate droplet deposition of pesticides sprayed by a UAV on paddy rice farms in a low volume. The above test results show that RhB can be feasibly used as a tracer to examine droplet deposition of pesticides aerially sprayed in a low volume.

中文翻译：

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RhB和BSF作为荧光示踪剂测定农药喷雾分布的用途

荧光示踪剂经常用于喷涂测试，但是其在光照下的稳定性以及从沉积载体上洗脱和回收的速率对测试结果的准确性至关重要。光谱分析表明，RhB和BSF的吸收波长分别为573.8 nm和494.6 nm，最多在不间断的阳光下，其回收率分别为93.5％–98.2％和95.5％–99.4％。在良好的光稳定性下，两种着色剂都可以从载玻片和聚酯薄膜卡上洗脱并回收，而从滤纸上回收的则不多。由于示踪剂受光的影响，当使用聚酯薄膜卡作为接收器时，使用了不同颜色的塑料板作为垫板，发现红色垫板可以在2小时内将洗脱回收率提高3％。我们的目标是通过评估喷雾方式对农药喷雾的沉积和漂移潜力的影响，确定哪种化学物质最适合用作空中喷雾农药长距离运输模拟的示踪剂。在一个农场进行的测试表明，所研究的两种着色剂可以有效地用作示踪剂，以研究无人机在少量稻田上喷洒的无人机滴下的农药的液滴。以上测试结果表明，RhB可以用作示踪剂，以检查以小体积空中喷洒的农药的液滴沉积。