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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

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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
leaves were 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 byChina'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 therisks 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.

Keywords:
Chinese tea continuum source graphite furnace atomic absorption spectrometry heavy metals quantitative analysis

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Informasi Detail

Judul Seri

j o u rnal of food and drug a n a l y s i s

No. Panggil

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Penerbit

: Elsevier Taiwan., 2016

Deskripsi Fisik

j o u rnal of food and drug a n a l y s i s 2 4 ( 2 0 1 6 ) 4 6 e5 5

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

Food And Health

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

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