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对长期作业在５０Ｈｚ、２７．５ｋＶ电力牵引供电网环境中的工人１１２４人，对照组４１９人，血清Ｆｅ、Ｃｕ、Ｚｎ含量测试结果：观察组血清Ｆｅ、Ｃｕ含量和血清Ｃｕ／Ｚｎ比值在正常成人参考值范围内显著地高于对照组、血清Ｚｎ含量显著地低于对照组。揭示工频高压低电磁场强度，可能引起人体血清Ｆｅ、Ｃｕ、Ｚｎ含量及Ｃｕ／Ｚｎ比值发生生理性变化。
1124 workers and 419 control subjects with long-term operation in 50Hz, 27.5kV electric traction power supply network, serum Fe, Cu, Zn content test results: the observation group serum Fe, Cu and serum Cu / Zn ratio in normal Significantly higher in adult reference range than the control group, serum Zn levels were significantly lower than the control group. Reveal the high-frequency low-frequency electromagnetic field strength, may cause human serum Fe, Cu, Zn content and Cu / Zn ratio of physiological changes.