The Effect Of Detector Voltages

Purpose: To use indicators to test for the presence of organic compounds in certain substances.

Holmes, Garnett, Bureau of Plant Industry United States, and Bureau of Chemistry and Soils United States. Soil Survey of The Yuma Area, Arizona-California. N.p.: Govt. print. off., 1905

Next, a linear graph of voltage vs. current was collected by turning the voltage between 0.25 V and 0.50 V, then increasing it to slowly approach the maximum voltage value. By doing this, current values were collected for several voltage intervals. All values for this procedure were recorded in a table and plot and are shown in the data section. A linear regression of the voltage vs. current data was then taken to find the experimental resistance value.

The Environmental Protection Agency (EPA) has come to the lab group to investigate an abandoned chemical company. In specific, an unknown compound is to be investigated and identified. The lab group takes this goal a step further and also compares it against products found around the member’s homes. Multiple titrations will be performed, both with use of the PASCO program and by manual indicator. Through these experiments, different calculations will be performed to help in the analysis. In addition, a dilution study is performed to see the effects of dilution against an acid or base. The procedures used to identify the unknown compound can be used in the future, in case of other abandoned chemical companies.

The physical and chemical properties of the soil were analyzed. The soil of the experimental site was lateristic, fairly homogenous with good drainage and moderate acidic. The details of physical and chemical properties are shown in Table 3.2 and the summaries of methods are described in Appendix

tetrachlorodibenzop-dioxin was still present in the silty soils and 63% in the sandy soils, a slight

Chromatography, or the separation of a mixture by passing it through a medium that contains components of varying attractive properties in a suspension, is a helpful tool in the scientific community and beyond. Although chromatography is mainly associated with the separation of colors, chromatography is the gateway to scientific advancement and an increase in public health initiatives. Environmental testing laboratories, such as Environmental Protection Agency (EPA), utilize chromatography to test drinking water and to monitor air quality (???). Their goal is to detect small quantities of contaminants such as dangerous PCBs in waste oils and pesticides (???). With the use chromatography, the EPA is making strides in protecting both human health and the environment.

Use of pesticides can result in residue levels in commodities and in the immediate environments, such as soil, biota and aquatic systems.

Moss samples collected at Parc mine show no statistically significant correlation between Zn and Cd in the moss and soil samples although a strong correlation can be found for Pb and Mg (table *). Pb is highest in site 2 at 27284 ppm and drops to 95 ppm in site 3. Zn ranges to from 311 ppm to 54 ppm; Cd from 2400 ppm to 19 ppm and Mg from 182 ppm.

The microbial organisms living in Peatlands, they love carbon; and they play a major role in “global carbon cycling”; therefore, peatlands are called “carbon reservoir.” Peatland microbes work well in the cool temperature, but the global temperature is increasing because of human activities such as farming, burning of fuel and disposing of industrial gas. The authors focused their study on the influences of human activities causing natural changes on the living and activities of “peatland microorganisms” especially fungi. Different types of fungi were observed on different peatland soils; moreover, statistical, analytical and graphical skills were successfully applied in this study. Finally, the article’s authors concluded that the microbial

Analysis of representative soil samples will also be undertaken to characterise different soil material, for example, pH, particle size, organic matter, potential contaminants and so on.

Alpha spectroscopy is a technique for quantification of alpha particles and identification of its parent radionuclide using a silicon diode semiconductor detector [Knoll, 2010]. These detectors operate in a vacuum to enable them to detect alpha particles emitted from a source without degradation of the alpha particle energy. The alpha particles are transformed into electrical pulses which are amplified and shaped prior to conversion into a differentiated pulse height spectrum by a multichannel analyzer. The resultant spectrum is characteristic of the energy of the originally alpha particle and can therefore be used to identify the parent radionuclide [Boll et al, 1997].

Heavy metal contamination is one of the most serious and widespread forms of soil pollution [1, 2]. Many industrial and urban areas are polluted with

The mobility of Cd in rice straw treatment was low by increasing residual fraction (Fig4). (Cui et al., 2008) has reported that Cd speciation model calculations compared to the binding capacity of soil organic matter, the capacity of rice straw is much less import. This statement may be resulted to low bioavailability of Cd in treatment which contains higher organic matter. Soil organic matter significantly reduces the exchangeable fraction of the initial given heavy metal, their water-soluble ions and converts them into a residual fraction (Lv et al.,

IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE AWARD OF MASTER OF SCIENCE (ENVIRONMENTAL CHEMISTRY AND POLLUTION CONTROL)