CAJ | 학술논문

能量色散X射线荧光光谱（EDXRF ）法作为化学元素分析的一种检测手段，被广泛应用于地质勘测、工矿石油、生化医疗及刑侦考古等各行各业，它是户外现场检测与分析的首选方法之一。利用 EDXRF法检测茶叶中金属元素含量，对环境条件要求低，且无需对茶叶样品进行化学处理。实验检测发现，用该方法分析茶叶中金属元素时，有效X射线荧光光子能量段在3～16 keV之间，故校正光谱元素选择位于能量中心位置（8 keV ）附近的铜元素，并用铜元素定标做标准曲线，在茶叶有效X射线荧光光子能量段中，通过样品加标方法分析铜、铁、锌、铅四种元素，求得平均检出限为1.25 mg · kg －1。在检测茶叶中金属元素的化学方法中，选用火焰原子吸收法测得茶叶中金属元素含量作为标准值，比较得出，EDXRF法测得数值实际相对误差小于6％，相对标准偏差小于5％，经过 t检验， p＞0.05，说明EDXRF法与火焰原子吸收法在统计学上没有显著差异，两种方法所测结果吻合。结果表明，EDXRF法检测茶叶中金属含量的方法是可行的，结果满足现场检测分析需求。
능량색산X사선형광광보（EDXRF ）법작위화학원소분석적일충검측수단，피엄범응용우지질감측、공광석유、생화의료급형정고고등각행각업，타시호외현장검측여분석적수선방법지일。이용 EDXRF법검측다협중금속원소함량，대배경조건요구저，차무수대다협양품진행화학처리。실험검측발현，용해방법분석다협중금속원소시，유효X사선형광광자능량단재3～16 keV지간，고교정광보원소선택위우능량중심위치（8 keV ）부근적동원소，병용동원소정표주표준곡선，재다협유효X사선형광광자능량단중，통과양품가표방법분석동、철、자、연사충원소，구득평균검출한위1.25 mg · kg －1。재검측다협중금속원소적화학방법중，선용화염원자흡수법측득다협중금속원소함량작위표준치，비교득출，EDXRF법측득수치실제상대오차소우6％，상대표준편차소우5％，경과 t검험， p＞0.05，설명EDXRF법여화염원자흡수법재통계학상몰유현저차이，량충방법소측결과문합。결과표명，EDXRF법검측다협중금속함량적방법시가행적，결과만족현장검측분석수구。
As it has been certified by experimental testing that when using the energy‐dispersive X‐ray fluorescence (EDXRF) method to analyze the metallic elements contained in the tea the energy segment of effective X‐ray fluorescence photons is located between 3 and 16 keV .Accordingly the spectral correction element is targeted at the copper elements located near the energy center(8 keV) .The copper elements are also used as the picketage to be the standard curve .In the energy segment of effective X‐ray fluorescence photons contained in the tea 1.25 mg · kg -1 of the average detection limit was obtained by using the spiked method to analyze four elements of copper ,iron ,zinc and lead .Compared with the flame atomic absorption spectrum (FAAS) , the actual relative error of the tested value by EDXRF is less than 6% ,and the relative standard deviation is less than 5% .The result by T test shows that p>0.05 .The conclusions are that there are no statistically significant differences between EDXRF and FAAS .The measured results gained by the two methods agree with each other .And EDXRF can be used thoroughly to test the metal contents contained in the tea .The result shows that it is feasible to test the metallic contents contained in the tea by EDXRF ,and its measured result can meet the requirements of field testing and analysis .