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Chiết xuất vi mô lỏng-lỏng có hỗ trợ muối của ion Cr(VI) sử dụng chất lỏng ion cho việc cô đặc trước khi xác định bằng quang phổ hấp thụ nguyên tử ngọn lửa
Tóm tắt
Chúng tôi báo cáo về phương pháp chiết xuất vi mô lỏng-lỏng có hỗ trợ muối để tách các phức hợp cation của ion Cr(VI) sử dụng chất lỏng ion (IL) thân nước 1-butyl-3-methylimidazolium tetrafluoroborat và kali hydro photphat. Đây là một kỹ thuật mới, đơn giản, không độc hại và hiệu quả cho quy trình trước xử lý mẫu, hiển thị hiệu suất chiết xuất cao và đại diện cho một nền tảng mới nơi mà Cr(VI) được phức hợp với 1,5-diphenylcarbazide (DPC) trong môi trường axit sulfuric. Phương pháp này đã được áp dụng để chiết xuất Cr(VI) dưới dạng phức hợp Cr(VI)-DPC trước khi xác định bằng quang phổ hấp thụ nguyên tử ngọn lửa. Ion Cr(III) cũng có thể được xác định bằng quy trình này sau khi được oxy hóa thành Cr(VI). Việc chiết xuất chủ yếu bị ảnh hưởng bởi lượng IL hòa tan trong nước, loại và lượng muối vô cơ, pH và nồng độ DPC. Đồ thị hiệu chuẩn là tuyến tính trong khoảng từ 3 đến 150 μg L−1 của Cr(VI), và giới hạn phát hiện là 1.25 μg L−1. Phương pháp này đã được áp dụng thành công trong việc phân tích và xác định nồng độ vết của Cr(III) và Cr(VI) trong các mẫu nước môi trường chứa hàm lượng muối hòa tan cao hoặc muối thực phẩm.
Từ khóa
#Cr(VI) #chiết xuất vi mô #chất lỏng ion #quan trắc môi trường #quang phổ hấp thụ nguyên tử ngọn lửaTài liệu tham khảo
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