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Kỹ thuật phân tích NanoSIMS và ứng dụng của nó trong khoa học địa chất
Tóm tắt
Mặc dù sự cải thiện đáng kể về độ phân giải không gian, NanoSIMS vẫn duy trì độ phân giải khối lượng tương đối cao, độ nhạy và độ chính xác phân tích. Nó đã trở thành một nền tảng phân tích quan trọng để xác định thành phần hóa học của các vật liệu rắn, và đã được sử dụng rộng rãi trong các lĩnh vực khoa học như không gian, địa chất, khoa học sự sống và vật liệu, v.v. Bằng cách sử dụng chùm ion Cs+ có kích thước nhỏ chỉ 50 nm quét qua bề mặt mẫu, chúng tôi có thể thu được hình ảnh có độ phân giải không gian cao của tối đa 7 loại đồng vị cùng một lúc. Khi sử dụng cốc Faraday, độ chính xác phân tích cao từ 0,3‰ đến 0,5‰ (1SD) cho phân tích đồng vị C, O và S có thể đạt được. Mặc dù mức độ chính xác này vẫn thấp hơn so với SIMS thông thường, nhưng nó đã đáp ứng được các yêu cầu chính của khoa học địa chất. Vào năm 2011, NanoSIMS đầu tiên của Trung Quốc (Cameca NanoSIMS 50L) đã được lắp đặt tại Viện Địa chất và Địa vật lý, Học viện Khoa học Trung Quốc. Dựa trên cơ chế hoạt động và các chế độ phân tích của thiết bị, bài báo này sẽ giới thiệu một cách hệ thống các phương pháp phân tích được thiết lập với NanoSIMS và các ứng dụng tiềm năng của chúng trong khoa học địa chất. Các phương pháp này bao gồm hình ảnh phân bố nguyên tố vi lượng trong phân vùng khoáng sản, xác định tuổi Pb-Pb và U-Pb với độ phân giải không gian cao (2–5 μm), phân tích hàm lượng nước và đồng vị H cho kính silicate và apatite, phân tích đồng vị C cho kim cương và than chì, phân tích đồng vị O cho cacbonat, phân tích đồng vị S cho sulfide. Bên cạnh đó, các yêu cầu cụ thể cho việc chuẩn bị mẫu cũng sẽ được giới thiệu nhằm tạo điều kiện thuận lợi cho việc sử dụng của các nhà khoa học địa chất trong nước.
Từ khóa
#NanoSIMS #khoa học địa chất #phân tích đồng vị #bụi vi mô #phân tích nguyên tố vi lượngTài liệu tham khảo
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