Determination of ten heavy metals in the stems and leaves of medicinal industry hemp
A flame atomic absorption spectrophotometry or inductively coupled plasma mass spectrometry method was established to detect the content of ten heavy metals(Cu,Zn,Mn,Fe,Ni,Cd,Pb,Cr,Hg,As)in the stems and leaves of medicinal industrial hemp,and to analyze the possible sources of heavy metals.The results showed that the detection method was accurate and reliable,and the linear relationship between the ten heavy metal elements was good within their respective ranges(R2 ≥ 0.999).The mass concentrations of heavy metals(Pb,As,Cd,Hg,Cu)in the medicinal industry of cannabis all comply with the heavy metal limit standards for medicinal materials and herbal(plant)in the"Chinese Pharmacopoeia"(2020).However,the mass concentrations of Cu,Cr,and Hg elements exceed the minimum heavy metal limit standards of other countries and organizations,with exceeding rates of 63.64％,45.45％,and 9.09％,respectively.The main sources of heavy metals in the stems and leaves of medicinal hemp industry are environmental factors,followed by production and planting factors,as well as the multiple accumulation and synergistic effects of various residues.
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