By I. Mueller-Harvey, R.M. Baker
Presents simple education within the entire analytical technique for college kids, demonstrating why research is important and the way to take samples, sooner than they try and perform any research within the laboratory. Softcover.
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Extra info for Chemical Analysis in the Laboratory A Basic Guide
It is effective in removing most residues, grease and algae from flasks, burettes and pipettes if left in contact with the glass overnight. The mixture should be filtered occasionally through glass wool. Another good degreasing agent is 100 g KOH in 50 cm3 water then made to 1 litre with industrial alcohol. 48 Chapter 4 0 0 0 Hold the lid only by the collar; never by the stopper which may suddenly loosen, so that the lid can drop catastrophically, resulting in possible injury and a cost to the laboratory of El50 - 200.
0 0 0 With regard to the statistical analysis of the results, what will be your ‘null’ hypothesis? Will the concentration of the metals vary with depth in the soil? Will the concentration of the metals vary with the distance from the motorway? 3 River Pollution You need to investigate the total ‘load’ of the inorganic contaminants nitrate, ammonium and phosphate carried by a river, perhaps to estimate the amounts coming from farmland or to study the impact of a sewage works (wastewater treatment plant).
Greater intensity of sampling, by using a finer grid or by taking more samples per sampling unit, would give a better prediction of which areas require to be treated, especially if the pollutants were more strongly localised. On a real site, however, we would not know how the pollutant was dispersed and we would not be able to develop a customised sampling strategy. Instead, we would have to make some estimates or assumptions about the general character of the pollution and develop a general design (as above) that would apply to each target area of the site.
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