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首页> 外文期刊>Environmental toxicology and chemistry >DISTRIBUTION AND ACCUMULATION OF MERCURY IN TISSUES OF CAPTIVE-REARED COMMON LOON (GAVIA IMMER) CHICKS
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DISTRIBUTION AND ACCUMULATION OF MERCURY IN TISSUES OF CAPTIVE-REARED COMMON LOON (GAVIA IMMER) CHICKS

机译：主动饲养小鸡组织中汞的分布和累积

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We determined the distribution and accumulation of Hg in tissues of common loon (Gavia immer) chicks maintained for up to 15 weeks on either a control diet with no added methylmercury chloride (MeHgCl) or one containing either 0.4 or 1.2 μg Hg (as MeHgCl)/g wet-weight food. Total Hg and MeHg tissue concentrations were strongly positively correlated (r~2 ＞ 0.95) with the amount of Hg delivered to individual chicks throughout the course of the experiment. The pattern of differential Hg concentration in internal tissues was consistent within each treatment: Liver ＞ kidney ＞ muscle > carcass ＞ brain. Feather Hg concentrations were consistently higher than those of internal tissues and represented an important route of Hg elimination. Feather mass accounted for 4.3% ±0.1% (average ± standard error) of body mass, yet 27.3% ± 2.6% of total Hg intake was excreted into feathers. Our calculations indicate that 26.7% ± 4.9% of ingested Hg was not accounted for and, thus, either was never absorbed or was absorbed and subsequently eliminated in feces. With the additional excretion into feathers, 54% of ingested Hg was excreted. Demethylation was evident in the liver at all treatment levels and in the kidneys of chicks dosed at 1.2 μg Hg/g. Mercury concentrations were strongly positively correlated (r~2 ≥ 0.95) among internal tissues and with blood Hg concentration. Mercury concentrations of secondary feathers were moderately correlated (r~2 = 0.82-0.93) with internal tissues. We supply regression models that may be used to provide perspective and a useful means of interpreting the variety of measures of Hg exposure reported in the literature.
机译：我们确定了在不添加甲基氯化汞（MeHgCl）或不含0.4或1.2μgHg（作为MeHgCl）的对照饮食中饲养长达15周的普通懒惰（Gavia浸泡）小鸡的组织中Hg的分布和积累。 / g湿重食物。在整个实验过程中，总的Hg和MeHg组织浓度与递送给个体雏鸡的Hg量高度相关（r〜2＞ 0.95）。每次治疗中，内部组织中汞浓度差异的模式是一致的：肝＞肾＞肌肉＞ car体＞脑。羽毛中的汞浓度始终高于内部组织中的汞浓度，代表了汞消除的重要途径。羽毛质量占体重的4.3％±0.1％（平均值±标准误差），而总Hg摄入量的27.3％±2.6％被排泄到羽毛中。我们的计算结果表明，摄入的汞的26.7％±4.9％没有被考虑，因此，它从未被吸收或被吸收，随后在粪便中被消除。随着其他排泄物进入羽毛，所摄入的汞的54％被排泄。在所有治疗水平下，在肝脏中以及在以1.2μgHg / g剂量给药的雏鸡的肾脏中，明显存在脱甲基现象。内部组织中的汞浓度与血液中的汞浓度呈强正相关（r〜2≥0.95）。次羽的汞浓度与内部组织呈中等相关性（r〜2 = 0.82-0.93）。我们提供了可用于提供观点的回归模型，并提供了一种解释文献中报道的各种汞暴露量度的有用手段。

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