| 1.37 | sample | ||
| Portion of a material taken for qualitative analysis or quantitative analysis. | |||
| Note 1: | Taking a sample from a larger amount of material implies the existence of a sampling error,12 i.e., the measured quantity values of the portion's properties are only estimates of those of the parent material. | ||
| Note 2: | If the portion is removed with negligible sampling error it is termed an aliquot, or specimen. “Specimen” is used to denote a portion taken under conditions such that the sampling variability cannot be assessed, and is assumed, for convenience, to be zero. | ||
| Note 3: | The sampling plan should detail how a sample is obtained and any subsequent manipulations (see sample pre-treatment). | ||
| Note 4: | Fundamentals of sampling and sample preparation in analytical chemistry are detailed in ref. 27 and 28. | ||
| Note 5: | In analytical chemistry ‘sample’ must not be confused with a subset of a population for which the term “sample” is used in statistics. | ||
| See also: analytical sample, laboratory sample, primary sample, replicate sample, and spike. | |||
| 1.37 | sample | ||
| Portion of a material taken for qualitative analysis or quantitative analysis. | |||
| Note 1: | Taking a sample from a larger amount of material implies the existence of a sampling error,12 i.e., the measured quantity values of the portion's properties are only estimates of those of the parent material. | ||
| Note 2: | If the portion is removed with negligible sampling error it is termed an aliquot, or specimen. “Specimen” is used to denote a portion taken under conditions such that the sampling variability cannot be assessed, and is assumed, for convenience, to be zero. | ||
| Note 3: | The sampling plan should detail how a sample is obtained and any subsequent manipulations (see sample pre-treatment). | ||
| Note 4: | Fundamentals of sampling and sample preparation in analytical chemistry are detailed in ref. 27 and 28. | ||
| Note 5: | In analytical chemistry ‘sample’ must not be confused with a subset of a population for which the term “sample” is used in statistics. | ||
| See also: analytical sample, laboratory sample, primary sample, replicate sample, and spike. | |||