By I. Mueller-Harvey, R.M. Baker
Presents uncomplicated education within the entire analytical method for college kids, demonstrating why research is critical and the way to take samples, earlier than they try and perform any research within the laboratory. Softcover.
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Mineralised) in the soil before the crop can use it. e. protein). So the determination of different forms of nitrogen in the crop cannot prove or disprove that the crop was ‘organically’ grown. CHAPTER 2 The Sampling Plan, Sample Collection and Preparation 1 THE SAMPLING PLAN Anyone taking samples for analysis needs to realise the importance of stating adequately the problem they want to solve or identifying the basic questions that they want the analysis to address. Then they need to assess whether their plan is capable of giving results that will provide the answers.
Grinders made of stainless or hardened steel, for example, may increase the contents of iron, manganese, nickel and chromium in the sample. Other grinding materials may give other contaminants. This can be a problem in some trace analysis and it may be necessary to be especially careful in the choice of grinder and the intensity of grinding. Some polythene and polypropylene containers may give iron, manga- The Sampling Plan, Sample Collection and Preparation 25 nese, calcium, copper and zinc contamination to abrasive samples or to solutions kept in them.
Mark which shots showed Good accuracy and poor precision? Good accuracy and good precision? Poor accuracy and poor precision? Poor accuracy and good precision? Similarly, we have to be concerned with the accuracy and the precision of the measurements we make in analysis. If the instrument or the balance has been calibrated using incorrect standard weights, our results will be inaccurate, however carefully we do the work. Again, if the volumetric flask is not correctly calibrated, the measurements we make with it will be wrong.