Aluminium and cadmium concentrations in cocoa powder sampled in German Food Monitoring (GFM) 2005–2015 grouped by theoretical concentration-related geographical origins.

N sample number, SD standard deviation, P95 percentile 95. All cocoa powder samples analysed for aluminium and cadmium had quantifiable concentrations. Methods used for analysis: Graphite furnace atomic absorption spectroscopy (GFAAS) or Inductively coupled plasma mass spectrometry (ICP-MS). GFM codes: aluminium ss-1813000, cadmium ss-1848000, cocoa powder el-450401. Mean concentrations of all samples, origin A and origin B are compared. For both, aluminium and cadmium, considering Grouping 1 and 2, there are statistically significant differences in mean substance concentrations between all samples and origin B, all samples and origin A as well as origin B and origin A according to Kruskal-Wallis test (p ≤ 0.05).

本数据集涵盖样本量（N）、标准差（standard deviation, SD）与95百分位数（percentile 95, P95）三类统计指标。所有用于铝与镉含量分析的可可粉样品，其待测物浓度均可被定量检出。本次检测采用的分析方法为石墨炉原子吸收光谱法（Graphite furnace atomic absorption spectroscopy, GFAAS）或电感耦合等离子体质谱法（Inductively coupled plasma mass spectrometry, ICP-MS）。GFM代码信息如下：铝对应ss-1813000，镉对应ss-1848000，可可粉对应el-450401。本研究对全部样品、来源A样品与来源B样品的平均浓度进行了对比分析。针对铝与镉两种元素，结合组别1与组别2的分组情况，经克鲁斯卡尔-沃利斯检验（Kruskal-Wallis test）分析，全部样品与来源B样品、全部样品与来源A样品，以及来源A与来源B样品之间的待测物平均浓度均存在统计学显著性差异（p ≤ 0.05）。