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为获得与真实检测样品完全一致的含毒死蜱残留茶叶自然基体标准样品,建立了其制备方法。以每亩约31.2 g毒死蜱用药量对茶树喷洒0.22 g/L毒死蜱药液,监控检测施药后茶叶中毒死蜱含量,适时采茶,正常制茶,磨粉过网筛获得含毒死蜱残留茶粉样。经均匀性检验、稳定性检验、协同定值和不确定度评估,制得检测质量控制用含毒死蜱残留茶叶自然基体标准样品。
In order to obtain the standard sample of natural substrate of tea leaves containing chlorpyrifos that is completely identical with the real test sample, a preparation method thereof was established. The amount of chlorpyrifos was sprayed with 0.22 g / L chlorpyrifos at a rate of about 31.2 g per acre. The content of chlorpyrifos in the tea was monitored to detect the content of chlorpyrifos in the tea. Appropriate tea picking, normal tea making and milling were used to obtain residual tea powder samples containing chlorpyrifos . Through the uniformity test, the stability test, the collaborative setting and the evaluation of the uncertainty, the quality control of chlorpyrifos residues obtained from tea leaves with natural matrix standard samples.