查询词典 lead acetate

Meanwhile, the concentration of Pb,Zn and other heavy metals is rather high in the oxidation zone and decreasesdownward to levels that are unbelievably low for Pb-Zn mine tailings. Theseobservations suggest that heavy metals should be re-immobilized by secondaryminerals, rather than primary minerals, in the oxidation zone, and could be leachedout from suboxic environment due to low rate oxidative dissolution which preventsthe precipitation of secondary minerals in significant amount. Thus, cover scenarioswhich establish a suboxic environment beneath the cover layer might not always beeffective in preventing heavy metal release from mine tailings.Sequential extraction studies indicate that, in addition to heavy metal leaching,oxidation of the mine tailings increased the mobility of residual Zn, and Cu, while Pb remains immobile due to the formation of anglesite (PbSO4). Using the seven-step extraction technique developed by Dold (J. Geochem. Explor., 2003, 80: 55-68), galena dissolves in significant amount at step 2 most probably due to the strong complexing of Pb2+ by acetate, while other metal sulfides dissolve at step 6, which suggest that this extraction technique could not be used to evaluate the mobility of lead in natural environment

重金属含量均低于新鲜尾矿，但以硬化层中的含量最高(Pb、Zn含量分别为0.47%和0.93%)，往下大幅度降低，表明尾矿风化过程中形成的次生矿物对Pb、Zn等重金属元素有较强的固定作用，而次氧化带的淋溶作用造成了金属元素的大量流失；(4)与新鲜尾矿相比，硬化层中铅的可迁移性大大降低，硬化层之下尾矿样品中铅的可迁移性也不同程度降低，这是由于硫化物氧化产生的硫酸根与尾矿中的铅反应形成铅矾(PbSO_4)的缘故；(5)氧化作用使尾矿中的zn、Cu等重金属的可迁移性不同程度地增大，其中对锌的可迁移性影响最大，铜的可迁移性与铁比较相似，铅则容易与硫化物氧化形成的SO_4~(2-)反应形成铅矾(PbSO_4)；(6)为了减少尾矿污染和修复矿山环境，人们提出了各种不同的尾矿覆盖方案，本文的研究结果表明，这些方法不一定能够有效地阻滞污染元素的迁移。

Too much vitamin A acetate may lead to birth defects.

太多的维生素A醋酸酯可能导致出生缺陷。

The Company has been established for 20 years, and is continuously specialized in precise galvanization, coupling and lead frame galvanization, printed wiring board galvanization, hardware galvanization, nickel cobalt alloy electrolytic casting, profession products, and aluminum material surface treatment etc. Products include thionamic nickel sulfamate, cobalt sulfamate, nickel carbonate basic, cobalt carbonate basic, nickel acetate, and cobalt acetate etc.

公司成立20年来，一直为精密电镀、连接器与引线框架电镀、印刷电路板电镀、五金电镀、镍钴合金电铸、铝材表面处理等行业产品提供高品质的氨基磺酸镍、氨基磺酸钴、碱式碳酸镍、碱式碳酸钴、醋酸镍、醋酸钴等产品。

However, under the electron microscope, lead acetate induced nuclear pyknosis, mitochondrial swelling and vacuolization, and cell blebbing were observed.

但电子显微镜下已出现细胞核固缩；线粒体肿胀、正常结构消失并伴有空泡化；胞内出现鼓泡等现象。

Under electron microscope, lead acetate induced nuclear pyknosis, mitochondrial swelling and vacuolization, cell blebbing. But the structure of endoplasmic reticulum remained unchanged.

电镜下观察，乙酸铅能使细胞核固缩，线粒体肿胀、正常结构消失并伴有空泡化，胞内出现鼓泡现象，但内质网未见异常。

The effects of copper sulphate, lead acetate, zinc sulphate, cadmium chloride and neckel chloride on growth and root tip cell divition of Cucumis sativus seedlings were studied respectively.

选用黄瓜籽苗为材料，硫酸铜，醋酸铅、硫酸锌、氯化镉和氯化镍为化学处理试剂，研究它们对黄瓜籽苗的生长及其根尖细胞有丝分裂的影响。

According to the experiment design, twenty five ICR mouse were randomly assigned into five groups and administrated by oral gavage with 0,10,50,100 and 500 mg-kg1 body weight of lead acetate every other day for successive 28 days.

根据实验设计，25只ICR小鼠被随机分为5组，然后分别灌以0，10，50，100和500mg·kg~(-1)体重的醋酸铅溶液，隔天灌胃，实验持续28天，在第29天处死。

One week after administration of lead acetate and cadmium chloride, the numbers of NOS-positive IC reduced significantly.

探讨雷公藤及铅、镉等重金属元素对睾丸间质细胞一氧化氮合酶活性的影响。

Objective To explain the effects of nitric oxide on testis interstitial cells after administration of tripterygium wilfordii f., lead acetate and cadmium chloride.

目的 探讨雷公藤及铅、镉等重金属元素对睾丸间质细胞一氧化氮合酶活性的影响。

One week after administration of lead acetate and cadmium chloride, the numbers of NOS-positive IC reduced significantly. With prolonging administration of such metal salts NOS activity gradually reduced.

给予醋酸铅和氯化镉1周后，NOS阳性的睾丸间质细胞数量明显减少，并随给药时间延长而加重，NOS活性逐渐降低，给药4周后NOS阳性的睾丸间质细胞几乎不着色。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。