ANACHEM m3

21問 • 9ヶ月前

velante

通報

問題一覧

A chemical analysis is meaningless unless you begin with a meaningful sample.

sample preparation

is the process of collecting a representative sample for analysis.

sampling

The process of selecting a portion of the material, in some manner, to represent or provide information about a larger body of material.

sampling

Generally require some degree of sample preparation to remove substances that interfere with the analysis of the desired analyte

real samples

Bulk sample also called a _____ _____is taken from the lot for analysis or archiving (storing for future reference).

gross sample

Types of Sampling: Sample is collected randomly from the target population. Increments are taken in such a way that any portion of the bulk has the same probability of being sampled out. Bias is reduced to a minimum if not eliminated

random

Available information about the target population is used to help select samples Sample are taken according to a sampling plan to screen out materials with certain characteristics and/or select materials with other relevant characteristics. More biased, but fewer samples are required Used when the number of independent variables influencing the results of an analysis are to be limited

selective

Types of Sampling The target population is sampled at regular intervals in space or time (Systematic sample) Increments are taken at predetermined intervals as defined by the sampling plan Intermediate bias with respect to random and selective sampling.

systematic

Sample Preparation Target populations are conveniently subdivided into distinct units , in each of which random sampling is done. Advantage: the composition of each stratum is often more homogeneous than that of the entire target population, leading to lower sampling variance (uncertainty).

stratified

One lot of lotion in the finished goods section (1000 bottles)

Simple random sampling

Polymer film manufactured by a chemical company

Systematic sampling

Patient suspected of chronic poisoning

Selective sampling

Soil in your hacienda

Stratified sampling

SAMPLING OPERATIONS A single sample taken from the target bulk.

Grab sampling

SAMPLING OPERATIONS Several grab samples combined to form a single sample

Composite sampling

SAMPLING OPERATIONS Sampling done within the population without physically removing the sample

In-situ sampling

Canned sardines coming out through a conveyor belt

Composite sampling

Analysis of lunar soil in lunar environment

In-situ sampling

Soil in your hacienda

Grab sampling

______is a notorious ion exchanger that alters the concentrations of trace ions in solution.

glass

Therefore,plastic (especially ______) collection bottles are frequently employed.

teflon

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inorg

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phychem

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問題一覧

A chemical analysis is meaningless unless you begin with a meaningful sample.

sample preparation

is the process of collecting a representative sample for analysis.

sampling

The process of selecting a portion of the material, in some manner, to represent or provide information about a larger body of material.

sampling

Generally require some degree of sample preparation to remove substances that interfere with the analysis of the desired analyte

real samples

Bulk sample also called a _____ _____is taken from the lot for analysis or archiving (storing for future reference).

gross sample

random

selective

systematic

stratified

One lot of lotion in the finished goods section (1000 bottles)

Simple random sampling

Polymer film manufactured by a chemical company

Systematic sampling

Patient suspected of chronic poisoning

Selective sampling

Soil in your hacienda

Stratified sampling

SAMPLING OPERATIONS A single sample taken from the target bulk.

Grab sampling

SAMPLING OPERATIONS Several grab samples combined to form a single sample

Composite sampling

SAMPLING OPERATIONS Sampling done within the population without physically removing the sample

In-situ sampling

Canned sardines coming out through a conveyor belt

Composite sampling

Analysis of lunar soil in lunar environment

In-situ sampling

Soil in your hacienda

Grab sampling

______is a notorious ion exchanger that alters the concentrations of trace ions in solution.

glass

Therefore,plastic (especially ______) collection bottles are frequently employed.

teflon