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aliquot in analytical chemistry

Known amount of a homogeneous material, assumed to be taken with negligible sampling error.

Note 1: The term is usually applied to fluids.

Note 2: The term “aliquot” is usually used when the fractional part is an exact divisor of the whole; the term “aliquant” has been used when the fractional part is not an exact divisor of the whole (e.g., a 15 mL portion is an aliquant of 100 mL).

Note 3: When an aliquot is taken of a laboratory sample or test sample or the sample is otherwise subdivided, the samples have been called split samples.

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