Zinc

This experiment is to be used to determine the era of which the composition and thus the density of the penny changed, and what the other metal besides copper has made up the composition since 1962. First, ten pennies from three different time periods (1995-1999, 2000-2004, 2005-present) were gathered. All ten pennies from a specific time were weighed together on an analytical balance. Then, a fifty mL graduated cylinder was filled with twenty mL of water, which was recorded as the initial…

Zinc is an important dietary component in human beings and animals. Although not considered hazardous, overdose of Zinc may cause nausea, vomiting, dizziness, colics, fevers and diarrhea and if it exceeds a certain limit it may also prove to be toxic. Zinc, present in natural water in small concentration, most commonly enters the domestic water supply from deterioration of galvanized iron and dezincification of brass[1,2]. Industrial and household waste, discharges directly or indirectly through…

A detailed description of soil locations, textures and physio-chemical properties can be found in Sections 2.3.1(page 41) and 3.3.1(page 56). We selected four types of soils out of seven types of soils, namely MGA, KBA, TAA and DUA. Key soil characterisation of these four soils is summarised in Table 4.2. The reason why these four types of soils were chosen for this chapter was that they had distinct soil parameters in terms of total organic carbon (TOC), Fe oxide, Al oxide, pH which have been…

Percent Copper In Brass Lab Conclusion Emily Oleisky The purpose of this lab was to observe the amount of light a solution absorbs, and use the relationships in the Beer-Lambert Law to determine the quantity of a certain compound within a complex sample. First, the relationships between wavelength, concentration, and absorbance were determined. This lab focused on identifying the absorption of copper in various brass samples, and finding the percent copper in brass. In the first activity of the…

FOR more than two decades Wittenoom in WA’s Pilbara region was a mining stronghold. The small country town which lies around 1400kms northeast of Perth was also, at one stage, the only place in Australia that produced blue asbestos. But when demand for the deadly mineral began to wane and fears of serious health concerns began to emerge, the operation was shut down in 1966. However it was another decade before authorities realised the blue dust that swept throughout the town was extremely…

4.3.3. Binary mixture toxicity of As, Cd and Pb All the three metal mixtures (As + Cd, Cd + Pb and As + Pb) displayed synergistic response at the 10% level and strong synergism was observed for the mixture of As + Pb with CI value of 0.25. The observed synergism was extended up to 30 and 50% level for Cd+ Pb and As + Pb mixtures, respectively. The binary mixture of As + Cd showed an additive response at the 30-50% level. All the mixtures showed an antagonistic effect at the IC90 level and the…

1- identify and briefly describe the public health topic you chose. Public health in regards to exposure to heavy metals is always of concern. Exposure to lead has been a major environmental hazard for a very long time. Reference to Lin, S. (2011), reveals that, I t poses a threat to the health of individuals when an intolerable amount of lead is either inhaled or ingested. Routes of exposure to lead include contaminated air, water, soil, food, and consumer products. Occupational exposure is…

As the health and safety manager, I’ve identified that workers were exposed to cadmium and lead. Cadmium is a soft malleable transition metal. It is silvery bluish-white in color. Although toxic by nature, this chemical element is commonly used to create dry cell batteries. Like mercury, cadmium has the lowest melting point of groups three through eleven transition metals. Lead is a malleable soft heavy metal that is denser than most common materials. It bluish-white in color when freshly cut,…

4. Metal poisoning came to the foreground of the American consciousness when a spotlight was shown on the high lead levels in Flint’s water system in Michigan. Although many steps have been performed to reduce lead poisoning, namely in children, such as removing lead paint from homes in 1978, removing lead from gasoline, and proposing stricter laws on imported toys containing lead, heavy metal poisoning still exists. Chelation therapy is still the preferred medical treatment for such heavy metal…

Fig. 2 and Table 1 present the open circuit potential versus time curves and self-corrosion rate of Al, Alloy 1 and Alloy 2 electrodes in 2 M NaCl electrolyte, respectively. Corrosion rates were obtained by weight loss measurements in 2 M NaCl solution after 60 min. As seen in Table 1, the corrosion rate increases in the following order: Al ＜Alloy 1 ＜ Alloy 2. Fig. 2 indicates that open circuit potential of Alloy 1, 2 (especially Alloy2) is more negative than that of Al. It can be seen that the…