Thẩm định phương pháp xác định hàm lượng chì và cadmi trong hoa đậu biếc (Clitoria ternatea) tại quận Cái Răng, thành phố Cần Thơ bằng phương pháp quang phổ hấp thụ nguyên tử AAS

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Tác giả: Tạp chí Kiểm nghiệm và An toàn thực phẩm

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Kiểm nghiệm và An toàn thực phẩm, 2022

Mô tả vật lý: tr.443-450

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ID: 333859

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Hàm lượng cadmi (Cd), chì (Pb) được xác định trong mẫu hoa đậu biếc bằng phương pháp quang phổ hấp thụ nguyên tử (AAS). Thẩm định phương pháp được tiến hành thông qua xác nhận các thông số như khoảng tuyến tính, giới hạn phát hiện (LOD), giới hạn định lượng (LOQ), độ thu hồi, độ lặp lại và độ chụm trung gian. Kết quả thẩm định cho thấy LOD của Cd, Pb lần lượt là 1,20 và 6,20 μg /kg, trong khi đó LOQ của Cd, Pb lần lượt là 4,01 và 20,5 μg /kg. Độ thu hồi của Cd là 96 - 98% và Pb là 98 - 100%. Độ lệch chuẩn lặp lại tương đối (RSDr) của Cd, Pb lần lượt trong khoảng 1,50 - 2,50% và 1,90 - 2,13%. Trong khi đó, độ chụm trung gian của Cd, Pb lần lượt là 2,02% và 1,97%. Khoảng làm việc của phương pháp là 0,2 - 4 μg /L (Cd) và 3 - 30 μg/L (Pb) với các phương trình đường chuẩn đều có hệ số tương quan R2 ≥ 0,995. Phương pháp định lượng Cd, Pb bằng quang phổ hấp thụ nguyên tử là chính xác và có độ tin cậy cao, được sử dụng để phân tích các mẫu hoa đậu biếc thu thập ở quận Cái Răng, thành phố Cần Thơ.The content of cadmium (Cd), lead (Pb) was determined in butterfly pea flower samples by atomic absorption Spectrophotometer (AAS). Method validation was evaluated through of parameters such as linear range, the limit of detection (LOD), the limit of quantitation (LOQ), recovery, repeatability, and intermediate precision. The validation results showed that the LOD of Cd, Pb were 1.20 and 6.20 μg/kg, respectively, while the LOQ of Cd and Pb were 4.01 and 20.5 μg/kg, respectively. The recovery of Cd is 96 - 98% and Pb is 98 - 100%. The relative repeat standard deviation (RSDr) of Cd, Pb is in the range of 1.50 - 2.50% and 1.90 - 2.13%, respectively. Meanwhile, the intermediate precision of Cd, Pb is 2.02% and 1.97%, respectively. The working range of the method is 0.2 - 4 μg/L (Cd) and 3 - 30 μg/L (Pb) with the standard curve equations having the correlation coefficient R2 ≥ 0.995. The quantitative method of Cd, Pb by atomic absorption Spectrophotometer is accurate and highly reliable, used to analyze butterfly pea flower samples collected in Cai Rang district, Can Tho city.

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