Sampling

Question 1

A sample taken at a particular time within an interval of a few seconds to a minute

Answer 1

Grab sample

Question 2

A sample resulting from a sampling plan that can be expected to adequately reflect the properties of interest of the parent population

Answer 2

Representative sample

Question 3

A sample consisting of portions obtained from identified subparts (strata) of the parent population. Within each stratum, the samples are taken randomly

Answer 3

Stratified sample

Question 3

A sample that is deliberately chosen by using a sampling plan that screens out materials with certain characteristics and/or selects only material with other relevant
characteristics

Answer 3

Selective sample

Question 3

A sample taken, prepared, and stored in an agreed upon manner for the purpose of settling dispute

Answer 3

Umpire or referee or reserve sample

Question 3

Sample taken in a series of steps with the sampling portions being selected from the larger or greater number of portions of the previous step

Answer 3

Multistage sample

Question 4

Multiple (or two) samples taken under comparable conditions. This selection may be accomplished by taking units adjacent in time or space.

Answer 4

Replicate (duplicate) sample

Question 4

Units, increments, or samples taken one at a time or in successive predetermined groups, until the cumulative result of their measurements assessed against
predetermined limits, permits a decision to accept or reject the population or to continue sampling

Answer 4

Sequential sample

Question 4

A sample chosen on the basis of accessibility, expediency, cost, efficiency, or other reason not directly concerned with sampling parameters

Answer 4

Convenience sample

Question 4

A sample obtained by removing specific fractions by separation or selection techniques (heavy liquid, magnetic, sieving, etc.), analyzing the fractions separately, and
combining the results mathematically.

Answer 4

Combined sample

Question 4

A sample or a known fraction of the parent population in which the analyte has been isolated or (usually) concentrated before being submitted to the laboratory

Answer 4

Modified sample

Question 5

The selection, removal, and preparation of the test (analytical) portions from the laboratory sample.

Answer 5

In-laboratory Processing

Question 6

The combining of components, particles, or layers into a more homogeneous state.

Answer 6

Mixing

Question 7

The reduction in size of a granular or powdered sample by forming a conical heap which is spread out into a circular, flat cake. The

Answer 7

Coning and quartering

Question 7

The separation of a free-flowing sample into (usually) equal parts by means of mechanical device composed of divider chutes.

Answer 7

Riffling

Question 7

The mechanical reduction of the particle size of a sample by attrition (friction), impact, or cutting.

Answer 7

Milling or grinding

Question 8

An individual portion of material collected by a single operation of a sampling device.

Answer 8

Increment

Question 8

The collection of one or more increments or units initially taken from a population.

Answer 8

Primary sample

Question 8

A representative part of the primary (composite or gross) sample obtained by a division and reduction process

Answer 8

Reduced sample

Question 9

Portion of the sample obtained by selection or division

Answer 9

Subsample

Question 10

The sample or subsample sent to or received by the laboratory

Answer 10

Laboratory sample

Question 10

The quantity of material, of proper size for measurement of the concentration or other property of interest, removed from the test sample.

Answer 10

Test portion/analytical portions

Question 10

The test solution that has been subjected to reaction or separation procedures prior to measurement of some property.

Answer 10

Treated solution

Question 10

The sample, prepared from the laboratory sample, from which test portions are removed for testing or for analysis

Answer 10

Test sample/analytical sample

Question 10

Titration of bases, perchloric acid and aqueous base in an acetic solution

Answer 10

Potassium hydrogen phthalate (KHP), KHC8H4O2

Question 10

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

Answer 10

Aliquot

Question 10

Titration of silver nitrate

Answer 10

Sodium chloride, NaCl

Question 10

Titration of acids

Answer 10

Sodium carbonate, Na2CO3

Question 10

For redox reaction

Answer 10

Potassium dichromate, K2Cr2O7

Question 10

Standardization of EDTA solution

Answer 10

Zinc powder (in HCl or H2SO4)

Question 10

Solution prepared by dissolving, with or without reaction, the test portion in a liquid

Answer 10

Test solution/analytical solution