Recent Treatment of Data in Chemical Analysis

Takashiro Akitsu* and Atsuo Yamazaki

Department of Chemistry, Tokyo University of Science, Tokyo, Japan

*Corresponding Author:
Takashiro Akitsu
Professor of Chemistry, Department of Chemistry Faculty of Science,
Tokyo University of Science 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
Tel: +81-3-5228-8271
Fax: +81-3-5261-4631
E-mail: [email protected]

Received date: April 06, 2016; Accepted date: April 25, 2016; Published date: April 29, 2016

Citation: Akitsu T, Yamazaki A. Recent treatment of data in chemical analysis. Trends Green Chem. 2017, 3:2. Doi: 10.21767/2471-9889.100015

Copyright: © 2017 Akitsu T, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Not only in green chemistry but also in other fields of chemistry, there is a problem of analytical values spreading an error and noise in the case of arguing the data of substances or compounds thoroughly. Therefore, we have considered to establish a method of good assessed values based on a science of statistics for experimental data [1] taken from students’ experiments of chemistry [2] including various types of analysis.

According to general discussion by Bayes's theorem, attracting attention recently, when a theoretical framework T is give, a product of probability p(T | E) ∝ p(T)p(E | T) can be assumed where p (E | T) is probability after experiments, p (T) is probability before experiments. Moreover, average, median, mode as the best estimated values will be within standard deviation (std) deviated from average in many cases. Thus, all the three values may be the best estimated values. Based on this theoretical background, we attempted to compare data of certain years by using two data groups (1) required amount of sodium hydroxide as before experiments (2) resulting concentration of oxalic acid as actual experimental results during neutralizing titrates (theoretical framework).

For example, neutralizing titrates of oxalic acid (weak acid) by sodium hydroxide (strong base) exhibited average required amount of sodium hydroxide was 11.3 mL (std 1.91) and pH 6.91 (std 0.42) in a certain year. Different results were obtained in another year (Table 1) or using different indicators, though theoretical framework (experiments of neutralizing titrates) was identical.

Year 2010 2009 2008 2007
no. of data 32 32 36 32
average 0.049721 0.044708 0.045178 0.050472
std 0.004418 0.010489 0.010472 0.000583
median 0.0507 0.050131 0.050772 0.050477
frequency 0.06 0.06 0.06 0.06

Table 1: Oxalic acid experimental results for 4 years.


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