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通过田间试验和室内分析表明,不喷药的黄瓜果实的自然含铜量为0.54ppm。用比正常防治时使用的琥胶肥酸铜浓度大1倍液喷布黄瓜,1小时后采果,测得其总含铜量不超过2.03ppm,半衰期为3.5天。用正常浓度500倍液,每5天或7天喷药一次;连续着药2次或3次的果实,无论在那次喷药1天后采收,总含铜量都在1.86ppm以下。在土壤中的半衰期为5.2天。参照国家允许饮用水含铜3ppm的标准,认为使用该药剂是安全的。
Field experiments and laboratory analysis showed that the natural copper content of non-sprayed cucumber fruits was 0.54ppm. The cucumber was sprayed with 1 times larger than that of the normal sodium gluconate, and the fruit was collected after 1 hour. The total copper content was not more than 2.03ppm and the half-life was 3.5 days. With the normal concentration of 500 times the liquid, every 5 days or 7 days spraying once; continuous medicine 2 or 3 times the fruit, no matter after that spray 1 day after harvest, the total copper content of 1.86ppm or less. The half-life in soil is 5.2 days. Reference to the national standard for drinking water containing 3ppm of copper, that the use of the agent is safe.