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Hg and Cr content in wheat grains the mean and maximum value shall not exceed the national limit, but some samples of As, Pb and Cd content has exceeded the national limits.

In the wheat grain Hg and the Cr content mean value and the maximum value have not surpassed the country to limit the quantity the standard, but in partial sample As, Pb and the Cd content already surpassed the country to limit the quantity the standard.

wheat seeds and Cr Hg content in the 1961-1990 and the greatest value, but no more than the State allowable level in the sample part As Pb , and Cd content standards have been exceeded national limits.

Hg and Cr content in wheat grains the mean and maximum value shall not exceed the national limit, but some samples of As, Pb and Cd content has exceeded the national limits.