The aim of this study was to evaluate the potential of applying energy dispersive X-ray fluorescence (EDXRF) spectrometry to determine Ca, K, P, Mg, Fe, Zn, Cu, Mn, and Al concentrations for direct analysis of cocoa powder, chocolate powder, and powdered chocolate drink samples. The proposed method was calibrated using samples previously analyzed by inductively coupled plasma optical emission spectrometry (ICP OES). For comparison purposes, the samples were also analyzed by ICP OES after an acid digestion procedure, and no significant differences were observed between the concentrations determined by EDXRF when compared to those by ICP OES. The coefficients of correlation (R) from the calibration curves and the limit of quantification (mg kg⁻¹) were Ca (0.996, 0.030), K (0.985, 68), Mg (0.974, 0.020), P (0.986, 0.50), Mn (0.998, 3.6), Fe (0.981, 2.5), Cu (0.978, 1.3), Zn (0.996, 0.80), and Al (0.983, 7.5). The precisions obtained for the elements were between 1.5 and 7.8% (n = 7), indicating that the preparation of the pellets was efficient to perform analysis by EDXRF. Potassium was the macro-mineral with higher concentrations in the samples. In relation to the micro-minerals, Fe had the greatest concentration. Significant concentrations of Al were also found. It was found that, in general, samples of chocolate powder and powdered chocolate drink may be considered good sources for the ingestion of Mg, Mn, Ca, K, P, Fe, Zn, and Cu.

中文翻译：

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能量色散X射线荧光光谱法直接分析可可粉，巧克力粉和巧克力粉饮料中的多种元素

这项研究的目的是评估应用能量色散X射线荧光（EDXRF）光谱法测定可可粉直接分析中的Ca，K，P，Mg，Fe，Zn，Cu，Mn和Al浓度的潜力，巧克力粉和巧克力粉饮料样品。使用先前通过电感耦合等离子体发射光谱法（ICP OES）分析的样品对提出的方法进行了校准。为了进行比较，在酸消解程序之后，还通过ICP OES对样品进行了分析，与ICP OES相比，EDXRF测定的浓度之间没有发现显着差异。校正曲线的相关系数（R）和定量极限（mg kg ^-1）是Ca（0.996，0.030），K（0.985，68），Mg（0.974，0.020），P（0.986，0.50），Mn（0.998，3.6），Fe（0.981，2.5），Cu（0.978，1.3） ，Zn（0.996，0.80）和Al（0.983，7.5）。元素获得的精度在1.5％和7.8％之间（n  = 7），这表明颗粒的制备对于通过EDXRF进行分析是有效的。钾是样品中较高含量的大矿物。就微量矿物质而言，铁的浓度最高。还发现了大量的Al。已经发现，一般而言，巧克力粉和巧克力粉饮料的样品可以被认为是摄入Mg，Mn，Ca，K，P，Fe，Zn和Cu的良好来源。