During the course of study of the Relevant Impurities in Copper and Sulphur compounds used as Pesticides, by A bunch of Copper samples (Copper Oxychloride [Three replicates]; Copper
Hydroxide; Cuprous oxide; Copper Sulphate anhydrous; Copper Sulphate Tribasic and Copper Sulphate pentahydrate, respectively) and Sulphur samples (5 compounds) were tested to detemine their Relevant Impurities of Arsenic, Cadmium and Lead. New analytical methods were devised to estimate; identify and confirm their Active Ingredients and its Relevant Impurities The results obtained could be summarized as follow: All the concentrations of the Active Ingredients for the previous pesticides were in allowed limits and agreement with its Reference Active Ingredients. Results also revealed that the Arsenic concentrations in Copper samples ranged from 0.4938×10-3 to12.4907×10-3 mg/kg before storage and 1.1759×10-3 to 4.6608×10-3 mg/kg after storage, while they were ranged from 0.4286 to 3.1328 μg/g before storage and 2.6118×10-3 mg/kg to 12.6566×10-3 μg/g after storage in Sulphur samples. The maximum allowed limits for Arsenic concentrations in Copper samples ranged from5.92 to 49.20 mg/kg before storage and 5.80 to 48.57 mg/kg after storage while in Sulphur samples ranged from 352.665 to407.49 μg/g before storage and 351.288 to 405.45 μg/g after storage. Results also showed that the Cadmium concentrations in Copper samples ranged from 0.0286 to 0.0822 mg/kg before storage and0.0187 to 0.0772 mg/kg after storage, while they were ranged from 0.0217 to 0.0472 μg/g before storage and 0.0219 to 0.0495 μg/g after storage in Sulphur samples. The maximum allowed limits for Cadmium concentrations in Copper samples ranged from 5.92 to 49.20 mg/kg before storage and 5.80 to 48.57 mg/kg after storage, while in Sulphur samples ranged from 6.915 to 7.99 μg/g before storage and 6.888 to 7.95 μg/g after storage. The results also demonstrated that the Lead concentrations in Copper samples ranged from 0.4080 to 1.0948 mg/kg before storage and 2.7398×10-3 to 1.7956 mg/kg after storage ; while they were ranged from 0.2106 to 0.3165 μg/g before storage and 0.2159 to 0.4264 μg/g after storage in Sulphur samples. The maximum allowed limits for Lead concentrations in Copper samples ranged from 29.6 to 246 mg/kg before storage and 29 to 242.85 mg/kg after storage, while in Sulphur samples ranged from 34.575 to 39.95 μg/g before storage and34.575 to 39.75 μg/g after storage. Eventually, the aforementioned results clearly showed that all the previously evaluate Relevant Impurities in their tested pesticides demonstrated that; it has were below the international critical levels and have
been justified within the tolerance and guidelines of FAO/WHO.
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