《Table 2–Median C15N values calculated for the leaf tissue (n:5–7) .》

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《Detoxification of ferrocyanide in a soil–plant system》

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Minimum and maximum values are shown in parentheses.Different letters denote significant differences among the treatments.

The results from the15N enrichment in the leaf tissue allowed for the calculation of the actual amount of CN taken up and accumulated from the labeled K4[Fe（C15N）6]，applied to the growth substrate.To distinguish it from the directly measured CN content，the amount of CN calculated from the measured15N enrichment will further be referred to as C15N.The calculation was based on the assumption that regarding the very high15N enrichment（>99 atom%）of the labeled K4[Fe（C15N）6]，the whole amount of excess15N in the leaf tissue must originate from the labeled substance.Thus，the C15N calculated on the basis of the measured15N levels would represent the actual（total）amount of CN that has been removed from the substrate and allocated in the leaf tissue.Table 2 shows the median C15N values calculated for the old and young leaf tissue of the treated trees for the sixth，eighth and twelfth weeks of exposure.