ISO 3082:2017 鉄鉱石—サンプリングおよびサンプル準備手順 | ページ 5

3.1

lot

discrete and defined quantity of iron ore or direct reduced iron for which quality characteristics are to be assessed

3.2

increment

quantity of iron ore or direct reduced iron collected in a single operation of a device for sampling or sample division

3.3

sample

relatively small quantity of iron ore or direct reduced iron, so taken from a lot as to be representative in respect of the quality characteristics to be assessed

3.4

partial sample

sample comprising of less than the complete number of increments needed for a gross sample

3.5

gross sample

sample comprising all increments, entirely representative of all quality characteristics of a lot

3.6

test sample

sample prepared from an increment, a partial sample or a gross sample to meet all specific conditions for a test

3.7

test portion

part of a test sample that is actually and entirely subjected to the specific test

3.8

stratified sampling

sampling of a lot carried out by taking increments from systematically specified positions and in appropriate proportions from strata

Note 1 to entry: Examples of strata include production periods (e.g. 5 min), production masses (e.g. 1 000 t), holds in vessels, wagons in a train, or containers and trucks representing a lot.

3.9

systematic sampling

sampling carried out by taking increments from a lot at regular intervals

3.10

mass-basis sampling

sampling carried out so that increments are taken at equal mass intervals, increments being as near as possible of uniform mass

3.11

time-basis sampling

sampling carried out so that increments are taken from free falling streams, or from conveyors, at uniform time intervals, the mass of each increment being proportional to the mass flow rate at the instant of taking the increment

3.12

proportional mass division

division of samples or increments such that the mass of each retained divided portion is a fixed proportion of the mass being divided

3.13

constant mass division

division of samples or increments such that the retained divided portions are of almost uniform mass, irrespective of variations in mass of the samples or increments being divided

Note 1 to entry: This method is required for sampling on a mass basis.

Note 2 to entry: “Almost uniform” means that variations in mass are less than 20 % in terms of the coefficient of variation.

3.14

split use of sample

separate use of parts of a sample, as test samples for separate determinations of quality characteristics

3.15

multiple use of sample

use of a sample in its entirety for the determination of one quality characteristic, followed by the use of the same sample in its entirety for the determination of one or more other quality characteristics

3.16

nominal top size

particle size expressed by the smallest aperture size of the test sieve (from a square opening complying with the R20 or R40/3 series in ISO 565), such that no more than 5 % by mass of iron ore is retained on the sieve