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Chapter 8: Sampling, Standardization, and Calibration. A chemical analysis uses only a small fraction of the available sample, the process of sampling is a very important operation. Knowing how much sample to collect and how to further subdivide the collected sample to obtain a laboratory sample is vital in the analytical process.
29 sie 2023 · Describe and discuss the sources and types of sampling error and uncer- tainty in measurement. Acquire the techniques for handling numbers associated with measure-ments: scientific notation and significant figures. Explain the concept of data rejection (or elimination) and comparison of measurements.
29 sie 2023 · What Type of Sample to Collect? When implementing a sample plan often grab samples are used. In some cases composite sampling (combining a set of grab samples into one sample) is more useful. This strategy may be used if: There is interest in the target population’s average composition over time and space.
29 sie 2023 · The design of the sampling plan will focus on the breadth of surface water sources, and is easily adaptable to almost any body of surface water. Q1. Identify the key questions that must be considered when designing a sampling plan to obtain a representative sample.
1 sty 1996 · According to International Union of Pure and Applied Chemistry (IUPAC) a sample is defined as a portion of material selected from a larger quantity of material. Sampling is defined as the total of activities that end with the acquisition of the test portion (actual subject of analysis).
What is a sample? Sample: portion of material selected from a larger quantity of material2,3. Representative sample: sample resulting from a sampling plan that can be expected to reflect adequately the properties of interest in the parent population.2, 3.
A chemical sample is a small and easy-to-handle quantity of a bulk material. Samples are always made to be reasonable mimics of the bulk materials they represent. The sample and bulk material should have the same, or essentially the same, physical and chemical properties.
