We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Determination of Pb (Lead), Cd (Cadmium), Cr (Chromium), Cu (Copper), and Ni (Nickel) in Chinese tea with high-resolution continuum source graphite furnace atomic absorption spectrometry.
- Authors
Wen-Si Zhong; Ting Ren; Li-Jiao Zhao
- Abstract
The contents of lead, cadmium, chromium, copper, and nickel were determined in 25 tea samples from China, including green, yellow, white, oolong, black, Pu'er, and jasmine tea products, using high-resolution continuum source graphite furnace atomic absorption spectrometry. The methods used for sample preparation, digestion, and quantificational analysis were established, generating satisfactory analytical precisions (represented by relative standard deviations ranging from0.6% to 2.5%) and recoveries (98.91e101.32%). The lead contents in tea leaveswere 0.48e10.57 mg/kg, and 80% of these valueswere below themaximumvalues stated by the guidelines in China. The contents of cadmiumand chromiumranged from0.01mg/kg to 0.39mg/kg and from0.27mg/kg to 2.45mg/kg, respectively, remaining in compliancewith the limits stipulated by China'sMinistry ofAgriculture. Thecopper contentswere 7.73e63.71mg/kg; only 64% of these values compliedwith the standards stipulated by theMinistry of Agriculture. The nickel contents ranged from2.70mg/kg to 13.41mg/kg.Consequently,more attentionmust be paid to the risks of heavymetal contaminationintea.The quantitativemethod established in this work lays a foundation for preventing heavymetal toxicity in human from drinking tea and will help establish regulations to control the contents of heavy metals in tea.
- Publication
Journal of Food & Drug Analysis, 2016, Vol 24, Issue 1, p46
- ISSN
1021-9498
- Publication type
Article
- DOI
10.1016/j.jfda.2015.04.010