[Ten element contents and their distribution in fruits determinated by atomic absorption spectrometry].

OBJECTIVE

To investigate the contents and distributions of the Zn, Cu, K, Ca, Mg, Mn, Pb, Cd, Cr and Se elements in the fruits.

METHODS

The fruit samples were digested with wet method. Contents of zinc,copper, calcium,magnesium,potassium and manganese were determined by flame atomic absorption spectrometry (FAAS). Contents of lead, cadmium, chromium and selenium were determined by graphite furnace atomic absorption spectrometry (GFAAS).

RESULTS

There existed differences for the element distribution in each part of the fruits. The contents of lead in the grapes, dried jujubes and papaya were close to the pollutant concentration limits, but their contents were lower than standard limits. The contents of chromium in the Guoguang apples, pears, dry jujubes and cherry tomatoes were higher than standard limits. Selenium was detected in the Guoguang apples, bananas, pears, dry jujubes, papaya and pomelo. The contents of copper in the grapes and dry jujubes exceeded standard limits. The contents of zinc were lower than standard limits. The calcium contents were the highest in the papaya. The contents of magnesium and manganese were the highest in the dry jujubes. The contents of potassium were higher in the dry jujubes, pomelo and cherry tomato.

CONCLUSIONS

The highest levels of the elements were in the seeds,and the second levels were in the skin,the lowest levels were in the pulp. The element contents of the peel were higher than those the pulp.