Xác định đồng thời các hợp chất thuốc bảo vệ thực vật neonicotinoid trong đất trồng trà bằng phương pháp sắc kí lỏng siêu hiệu năng ghép nối đầu dò khối phổ hai lần

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Tác giả: Thị Hồng Đào Đỗ, Thị Anh Đào Lê, Công Hậu Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại: 635 Garden crops (Horticulture) Vegetables

Thông tin xuất bản: Tạp chí khoa học trường đại học sư phạm thành phố hồ chí minh, 2021

Mô tả vật lý: 403-413

Bộ sưu tập: Metadata

ID: 489080

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Chủ đề

Chất lượng của trà bị ảnh hưởng bởi nhiều yếu tố liên quan đến phương thức canh tác trồng trọt, bao gồm các đặc tính của đất cũng như việc sử dụng những hợp chất hoá học, đặc biệt là hợp chất thuốc bảo vệ thực vật. Nhóm hợp chất neonicotinoid (NEO) được xem là một trong các loại thuốc bảo vệ thực vật sử dụng trong nông nghiệp và có khả năng tích lũy trong đất. Trong nghiên cứu này, phương pháp xác định các hợp chất NEO trong đất trồng trà được khảo sát và thẩm định sử dụng QuEChERS và UPLC-MS/MS lần lượt là phương pháp xử lí mẫu và phương pháp đo. Cột sắc kí lỏng Acquity UPLC BEH C18 (130 Å, 1.7 μm, 2.1 x 100 mm) (Waters) được sử dụng để tách các hợp chất trên hệ máy UHPLC (UltiMate 3000) ghép nối với đầu dò khối phổ hai lần (TSQ Endura) của hãng Thermo Fisher Scientific. Phương pháp cho độ tuyến tính phù hợp (R2 và gt
0.995), độ lặp lại và độ tái lặp tốt (%RSD dao động trong khoảng 0.87-9.6%), hiệu suất thu hồi cao (81-102% đối với hầu hết các mẫu thêm chuẩn). Phương pháp đã thẩm định được áp dụng vào mẫu đất được thu thập từ các vùng trà ở miền Bắc (nơi trồng cây trà cổ thụ) và miền Nam (canh tác theo phương thức hữu cơ và VietGAP). Kết quả cho thấy các mẫu đất ở miền Bắc không phát hiện các hợp chất neonicotinoid và hợp chất imidacloprid có hàm lượng cao nhất (81.0 và #120583
và #120583
và #119896
và #119896
và #119896
−1) được ghi nhận trong mẫu đất ở miền Nam.The quality of tea is influenced by many criteria related to farming methods, including soil characteristics and the use of chemical substances, typically pesticides or insecticides. The group of neonicotinoids (NEOs) is among the pesticides used in agriculture with the potential of accumulation in soils. In this study, the method for determining NEOs in tea-tree plantation soils was investigated and validated based on QuEChERS and UPLC-MS/MS as the sample preparation and measurement methods, respectively. The Acquity UPLC BEH C18 column (130 Å, 1.7 μm, 2.1 x 100 mm) (Waters Corporation) was used to serve the separation performed on the UHPLC System (UltiMate 3000, Thermo Fisher Scientific) coupled with tandem mass spectrometry (TSQ Endura, Thermo Fisher Scientific). The methods showed a proper linearity (R2 và gt
0.995), an acceptable repeatability and reproducibility (%RSDs varied from 0.87-9.6 for both intra-day and inter-day), and high recoveries (81-102% for most of the spiked samples). The validated method was then applied to real soils collected from the tea plantations in the North (ancient tea plants) and South (organic and VietGAP), Vietnam. The results showed that undetected pesticide concentrations for northern soils and imidacloprid with its highest content (81.0 và #120583
và #120583
và #119896
và #119896
và #119896
−1) were recorded in the South.

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