Chemical Analysis in the Laboratory A Basic Guide by I. Mueller-Harvey, R.M. Baker

By I. Mueller-Harvey, R.M. Baker

Presents easy education within the complete analytical approach for college students, demonstrating why research is critical and the way to take samples, ahead of they try to perform any research within the laboratory. Softcover.

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By I. Mueller-Harvey, R.M. Baker

Presents easy education within the complete analytical approach for college students, demonstrating why research is critical and the way to take samples, ahead of they try to perform any research within the laboratory. Softcover.

Show description

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This means reducing the variability of replicate measurements as much as we can, or as much as is necessary for the purpose of the measurement. The measuring instruments should be set to be responsive to the parameter we are measuring, but relatively unaffected by other extraneous influences. In analysis, adequate precision of the measurement will depend not only on the instruments used but also on 44 Chapter 4 the technical skills of the analyst and standardisation of the analytical procedure.

Always remove powder or moisture from the pan immediately. Clean the pan and sweep out the weighing compartment thoroughly before and after use. Clean the bench area around the balance before and after use. 46 Chapter 4 0 0 Keep the balance covered when it is not in use to protect it from dust. Electronic balances benefit from being left on continuously. This keeps the balance warmed up, reducing the adverse effects of atmospheric humidity within the balance. It also avoids the power fluctuations associated with switching on and off which can shorten the life of some components.

Of course the converse applies too - if the cost of treatment is very low compared with the cost of analysis, then intensive sampling might not be cost effective. However, there might be other reasons for wishing to reduce the treatment as much as possible. For example, there may be some environmental impact associated with the treatment itself. pnl. go v:2080/DQOlsimsitelhome. h tm. 2 EXERCISES Devise a sampling plan for one of the following investigations or experiments. In each case, the investigation can be stated in terms of a hypothesis that is to be tested.

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