What is a standard accessory?
Some scientific analytical techniques are designed to find a number of individual substances inside the mixture. Sometimes it is simple, but some samples disrupt the ability of technology to assess the actual concentration of the substance in the mixture. Standard adding is a way to find the actual concentration of the material in the mixture by comparing the same mixture with more added material. By comparing the result received with a known amount of substance, the analyst can determine how much substance is present in the first sample.
chemicals tend to interact with each other, in different ways, depending on the properties of individual materials. In general, chemicals in a simple solution, such as sodium chloride (NaCl) in water (H 2 0,), can be recognized by analytical technique to assess the amount of NACL present in the solution sample. NACL concentration is not masked by the presence of other chemicals that disrupt the sensitivity of the analysis.
Some complex samples, such as stagnant water, contain a number of different molecules. The actual concentration of a substance of interest in the sample can be masked by the presence of these other chemicals. For example, the characteristics of the target substance may be changed by interaction or connecting to other components, resulting in a registered level of substance that is too low. Since the evaluation point of the concentrations of individual sample components is accuracy, it is a problem for chemists.
One way to solve the problem is to compare the unknown sample concentration with the known set of results for a similar sample. However, this includes many primary tests and samples can be very different in the composition, so the standard known set of results can be impractical. Instead of using Tje's complicated and possible costly method, chemists may decide to use standard adding.
This method of analysis includes a sample distribution into two or more parts. One remains unchanged but a chemist adds chemicals to DruHé parts. The chemical to be added is exactly the same as the substance in the sample that the chemist wants to know concentration. It adds a known amount of chemical to the second part of the sample and tests this and original sample. For greater accuracy, other parts with different concentrations of added chemicals can also be tested.
Since the analyst knows how much extra chemicals he put into changed samples, the original sample can be compared with the standard adding portions. This comparison of the results can tell the analyst how much of the substance was in the original sample. In general, mathematical calculations or a graph of standard results are used to determine the additional concentration in the sample. Standard census is a common analytical technique in chemical analysis, where it is also known as "sample improvement".