摘要:

In chemistry, as in any other science, there are two kinds of experiments. One involves qualitative observation, or perhaps semiquantitative measurement, and is performed to permit giving a yes-or-no answer to some question such as "does this compound contain an amino group?" or "does this substance exhibit significant bacteriostatic activity?" The other involves precise quantitative measurement and is performed so that some numerical value can be assigned to a quantity or physical parameter that characterizes the system being studied or the kind of behavior being observed.

ISSN:0007-8980    

DOI:10.1080/10408347908542709

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor

摘要:

One of the most remarkable properties widely used in chemical analysis is the ability of a metal ion solution or a chemical substance to change its color under the effect of external factors, most often chemical reactions. Such reactions are known as color reactions. Color reactions of practical value have been found for almost all inorganic ions. It would hardly be an exaggeration to say that until recently almost half of all analyses, particularly in important branches of industry and in agriculture, were based on colorimetric and, later, photometric (or spectrophotometric) techniques.

ISSN:0007-8980    

DOI:10.1080/10408347908542710

出版商:Taylor & Francis Group    

年代:1979

数据来源: Taylor