Answered: What is the difference between a…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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What is the difference between a primary and a secondary standard? What is the
difference between an MCL and an MCLG?

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PRIMARY STANDARD	SECONDARY STANDARD
This is the final reference standard used to calibrate the second standard.	Used in industrial measurement laboratories.
Very high precision and highest stability.	It is less accurate than the primary criterion.
Preserved under the most stringent conditions.	Obtained by comparing with the primary standard.
It is not used directly for measurement , but it is used to calibrate the secondary standard once every 10 or 20 years.	Exact copy of the basic standard in terms of building materials and length.
EXAMPLE - Saturated Weston Cell , International prototype measurement sample.	EXAMPLE - Unsaturated western cell

MCL

This means the maximum level of contaminant. The highest level of contaminant allowed in drinking water. The MCL is installed as close the the maximum contaminant target as possible using the best cleaning technology available.

MCLG

The long form MCLG (Maximum Contaminant Level Goal) refers to the level of contaminant of drinking water without known or anticipated health risks. MCLG provides a margin of safety.

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