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The catalase exists generally in the animal, the plant and the microorganism cell. Its catalytic decomposition cell metabolism produces H2O2 and returns to original state certain other oxide compounds, in adjustment cell avoid death process in vital role. This experiment through catalase catalytic decomposition H2O2, determines with the iodimetric is left over H2O2, again uses the Na2S2O3 titrate computation obtains the heavy metal ion in a big way the toxicity when to the catalase the influence to be also bigger. The result indicated thickly goes past along with the heavy metal in a big way, enzyme activity smaller, the leaf is poisoned is also bigger.

原文
过氧化氢酶普遍存在于动物、植物和微生物细胞内。它催化分解细胞代谢产生的H2O2和还原某些其他氧化物，在调节细胞免于死亡过程中起重要作用。本试验通过过氧化氢酶催化分解H2O2，用碘量法来测定剩下H2O2，再用Na2S2O3滴定计算得出重金属离子的毒性越大时对过氧化氢酶的影响也越大。结果表明随着重金属浓度越大，酶活性就越小，树叶中毒也就越大。

翻译文

The catalase exists generally in the animal, the plant and the microorganism cell. Its catalytic decomposition cell metabolism produces H2O2 and returns to original state certain other oxide compounds, in adjustment cell avoid death process in vital role. This experiment through catalase catalytic decomposition H2O2, determines with the iodimetric is left over H2O2, again uses the Na2S2O3 titrate computation obtains the heavy metal ion in a big way the toxicity when to the catalase the influence to be also bigger. The result indicated thickly goes past along with the heavy metal in a big way, enzyme activity smaller, the leaf is poisoned is also bigger.