能量色散X射线荧光光谱法测定海洋碎屑沉积物中28种元素

Determination of Twenty-eight Elements in Marine Clastic Sediment Samples by Energy Dispersive X-ray Fluorescence Spectrometry

采用粉末样品压片制样,利用Epsilon3能量色散X射线荧光光谱仪(EDXRF)对我国边缘海碎屑沉积物中28种主量元素和微量元素进行测定。使用33个海洋沉积物、深海沉积物、水系沉积物、三角洲沉积物和岩石标样等国内外标准物质建立标准曲线,采用仪器软件的数学模式校正基体效应和元素间的谱线重叠效应。经国家标准物质检验,分析结果与标样值吻合;元素的检出限为0.02~124.14μg·g-1;精密度(RSD)均小于9%。对我国边缘海碎屑沉积物样品进行分析,其测定值与重量法、电感耦合等离子体光谱法和电感耦合等离子体质谱法的测定值基本一致。鉴于Epsilon3 EDXRF具有体积小、多元素同时快速分析、准确度高和精密度好的优点,可考虑作为船载仪器,在科考现场测定海洋沉积物的元素含量,对于及时指导海上工作、撰写航次报告具有重要作用。

The compositions of twenty-eight major, minor and trace elements in clastic sediments(in the form of pressed powder pellet) of China marginal seas have been detected by using Epsilon3 energy dispersive X-ray fluorescence spectrometer(EDXRF). Thirty-three domestic and foreign certified reference materials including marine sediments, abyssal sediments, stream sediments, delta sediments and rock standards were used to establish calibration curves. The matrix effects and overlapping effects of element spectrum can be corrected by using the application software. National reference materials were selected for the certification of the accuracy of the method, and the analytical results for these meterials were well agreed with the certificate values. The detection limits for components is 0.02~124.14 μg·g-1 and the precision of the method is below 9%(RSD). The clastic sediments from China marginal seas were analyzed, and the analytical results of these sediments were consistent with the values obtained by using gravimetric method, inductively coupled plasma optical emission spectrometry(ICP-OES) and inductively coupled plasma mass spectrometry(ICP-MS). Due to its small volume, rapid and multi-elemental measurements, good precision and accuracy, Epsilon3 EDXRF can be considered to be a shipboard instrument determining elements of marine sediments on site, which is vital to guide the work at sea and write the cruise report in time.