With the development of science and technology, why can't instrumental analysis replace chemical analysis completely?
Chemical analysis accuracy is very good, but the precision is not good, that is a constant or semi trace components can accurately measure the content of trace components, but for the poor even can't be detected, the error range is small, usually require control in less than +-0.1%, the instrument analysis accuracy is poor but the precision is good, can a qualitative or quantitative measure of trace components, but the error range is larger, +-1% or more.
The scope of instrumental analysis and chemical analysis is differentChemical analysis is mainly applicable to the content of analyte in constant or half trace components, while instrumental analysis is mainly used for the analysis of trace or even trace components.
For example, for example, a detection component is detected in the content is 10%, then the detection error in +-1% is relatively large, the detection of 9%-11%, +-0.1% and error is reasonable, namely 9.9%-10.1% detection at this time for chemical analysis, instrument analysis obviously large error for the content; 0.1% components, error +-1% is completely acceptable. The detection of 0.09%-0.11%, and the error in +-0.1% is not necessary, the range of 0.099%-0.101% detection in analytical chemistry is neither necessary nor meaning, then apply the instrument analysis.
