Comparative analysis of trace elements in five marine-derived shell TCM using multivariate statistical analysis ICP-MS analysis on inorganic elements in Polygoni Multiflori Radix from different habitats and commercial herbs Determination of five kinds of heavy metals in Anoectochilus roxburghii by ICP-MS Determination of 25 kinds of minerals in Mailuoning Injection by inductively coupled plasma mass spectrometry with microwave digestion Element Colocalization in Wheat Seed Revealed by Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS)