Toxic and Essential Elements in Different Types of Compost Samples

The aim of this study is the evaluation of toxic and essential elements levers in compost of main farming areas in Yunnan, China. The determination Of the nitric acid/hydrogen peroxide soluble contents of 18 micro - and macro-elements (As, Pb, Cd, Ni, Cr, Hg, Co, Mo, Se, Cu, Zn, Mn, B, P, K, Ca, Mg and Fe) in composts was developed by the microwave digestion, technique combined with inductively coupled plasma optical emission or mass spectrometry. This investigated was focused on different types of compost. All of the results were compared with Standards and guidelines for marketable composts Mean characteristics of Compost's proved to be in good agreement with the specification of the GB quality assurance for :compost except a small portion of arsenic content and cadmium in samples could be above the GB specification, as well as one sample of chromium and mercury content which may cause serious environmental impacts. The experimental study was conducted Using three GB standard reference materials. Additional validation data are provided bases on the analysis of 9 different types of samples by the proposed method and using comparative Methods Of official GB methods. The calculated accuracy and precision confirmed the good performance of the adopted procedures.