Determination Of Sample Volume Research Articles

Uncertainty Evaluation for Determination of Sibutramine in Health Food by HPLC-MS/MS

High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was used to determine the content of sibutramine in health foods according to the BJS 201701 standard Determination of Compounds such as Sibutramine in Food. By evaluating each uncertainty component, the influencing factors of the uncertainty were identified and the expanded uncertainty of sibutramine detection in health foods was provided. Using the example of illegal addition of sibutramine to health products, the HPLC-MS/MS method was used for qualitative screening and quantitative analysis of samples. The sources of uncertainty in the quantitative results were analysed, including sample weighing, sample volume determination, standard solution preparation, standard curve fitting and determination of sample repeatability. The synthetic relative standard uncertainty of the measurement results was calculated and the expanded uncertainty was reported. By optimizing the liquid phase conditions, the sample can be detected within 5 min with a linear correlation coefficient of 0.998. When the content of sibutramine in health products was 42.2 mg/kg, the extended uncertainty of the results was 4.56 mg/kg (k = 2) with a 95% confidence interval. Among the various components affecting the results of detection, the uncertainty introduced during the process of preparing the standard solution has the greatest impact on the results. A proper evaluation of the uncertainty, detailed analysis and quantification of the various sources of uncertainty can help to improve the reliability of test results.

Investigation of Effective Factors on Consumers’ Desire for Organic Products Payment, Case Study: Kermanshah Province Agricultural Bank Staffs

The present research’s main purpose is to evaluate the effective factors in customers desire to pay for organic products. The method of research is practical based on the goal of research and due to lack of complete control of research variables is none experimental, based on the data identity, data are qualitative and based on gathering method, data are provided in the field of study and about the feature of research it is communicative-visual kind. The statistical society contains all staffs of Kermanshah province agricultural bank staffs containing 418 people among which 200 peoples selected by the Cochran sample volume determination formula as the statistical sample and by random sampling method and by drawing. The tool to gather information in this research contains a researcher answer sheet whose justification confirmed by the special panel of agricultural training and privilege in Ilam Azad university agricultural management. The research stability obtained through the Cronbach’s alpha at 0.87. The dependant variable also declined to pay for the organic production and dependant variables containing individual features, knowledge to organic production, on time informing and the customer expected features, cultural factors and economical issues. The data analysis by the SPSS software and in two level of descriptive statistics (the central and distributed scales) and analytic statistic correlation coefficient for connecting theories, the average comparing test for the theories comparison and also multiple regressions performed step by step. The results showed that the relation between the economical factors and desire to pay for organic products has positive meaningful relation. The results showed that the economical factors and price, cultural factors and connecting factors to advertisement and informing have the maximum effect on desire for payment by customers for organic products.

Some Considerations on the Determination of Sample Volume by the Volumenometric Method. ——On the Sampling, Selection and Measurement Errors.——

Some Considerations on the Determination of Sample Volume by the Volumenometric Method. ——On the Sampling, Selection and Measurement Errors.——