The measurement analysis against environmental sample is required to prepare the environmental regulation for environmental management and administration and judge the regulation. The proficiency test evaluation should be carried out periodically to acquire the reliability against the results of mea...
The measurement analysis against environmental sample is required to prepare the environmental regulation for environmental management and administration and judge the regulation. The proficiency test evaluation should be carried out periodically to acquire the reliability against the results of measurement analysis. It is one of quality assurance that is laboratory operation plan that defines the standardized sequence so that the trustable analysis data and highly-reliable results can be acquired. It is possible to compare and evaluate the experimental organizations by performing proficiency test evaluation, but it is difficult to judge the error against the measured values.
So, this paper is willing to investigate the error that can be generated when analyzing 6 heavy metals (As, Cd, Cr, Cu, Mn, Pb) using ICP-OES. While ICP-OES has the merit that can analyze multi-element simultaneously, it can influence on the measure values due to several interference. Among them, the measured values of analyzing different matrix and wavelength were analyzed by comparing to CRM (Certified Reference Material_here after true value). In case of matrix, the diluted matrix of standard solution and sample of diluted matrix for making the calibration curve were analyzed after diluting with each distilled water (D.I water), 5% and 25% of nitric acid and, in case of selected wavelength, the wavelength that standard methods for the examination of water and device prefer was selected as top priority.
As the results of calculating the accuracy and precision against the measured values, the accuracy of Arsenic was 74.7% in wavelength of 228.812 nm in case of condition 3 and that of lead was 74.4% in wavelength of 261.417 nm in case of condition 3. Except for these, the accuracy of 75∼125% and standard deviation 25% against the precision that were suggested from standard methods for the examination of water were all satisfied. However, the case that analyzed with the same matrix could gain the better measured values than the case that was analyzed with different matrix. And there were the differences for each item along the concentration of acid though it was diluted with the same matrix.
Regarding wavelength, the similarity to true value fell as As of 228.812nm, Cd of 326.105nm and Pb of 261.417nm. The measured values of Cr, Cu and Mn were lower against the true value comparing to the rest 3 items. But the similar tendency was shown among the wavelengths of each item.
It was measured after making the matrix different. As, Cd are Pb similar in the same matrix regardless the concentration of acid. The measured values that analyzed Cr and Cu with the condition 1 appeared higher than the ones that analyzed it with the condition 5 and 9.
In case of diluting it with different matrix, the measured values got lower as the concentration of acid added to sample matrix in all items was higher. The measured values of As, Cd and Mn got higher as the concentration of acid added to matrix of standard solution got higher.
The measured values got higher in case the matrix that diluted the sample was 25% of nitric acid regarding Cr, Cu and Pb, and the measured values appeared the same in case of distilled water and 5% of nitric acid. And, in case of different matrix, the measured value of Cr, Cu and Pb were less influenced by the concentration of acid comparing to that of As, Cd and Mn.
It is the influence of wavelength and matrix for each item against the measured values. In case of As, Cd and Pb, the measured values that analyzed the same matrix (condition 1, 5 and 9) was similar to the true value. But the measured values that analyzed it with different matrix (condition 2, 3 and 6) were more similar to the true value than the measured values that analyzed it with the same matrix (condition 5 and 9).
As the results, the measured values that analyzed it with the same matrix was more similar to the true value than the measured values that analyzed it with the different matrix in case of analyzing 6 items of As, Cd, Cr, Cu and Mn simultaneously. And the analysis with 5% of Nitric acid can gain the better results than distilled water with 25% of Nitric acid. However, it should be analyzed by considering the influence of diluting matrix by classifying As, Cd, Cr, Cu and Mn in order to get the better results.
And the measure values of Cr and Mn were not influenced by the wavelength largely. The wavelength of 228.812 nm should not be used for As and that of 326.105 nm should not be used for Cd. It would be good to analyze it by using 324.754 nm and 327.395 nm for Cu, 220.353 nm for Pb.
The measurement analysis against environmental sample is required to prepare the environmental regulation for environmental management and administration and judge the regulation. The proficiency test evaluation should be carried out periodically to acquire the reliability against the results of measurement analysis. It is one of quality assurance that is laboratory operation plan that defines the standardized sequence so that the trustable analysis data and highly-reliable results can be acquired. It is possible to compare and evaluate the experimental organizations by performing proficiency test evaluation, but it is difficult to judge the error against the measured values.
So, this paper is willing to investigate the error that can be generated when analyzing 6 heavy metals (As, Cd, Cr, Cu, Mn, Pb) using ICP-OES. While ICP-OES has the merit that can analyze multi-element simultaneously, it can influence on the measure values due to several interference. Among them, the measured values of analyzing different matrix and wavelength were analyzed by comparing to CRM (Certified Reference Material_here after true value). In case of matrix, the diluted matrix of standard solution and sample of diluted matrix for making the calibration curve were analyzed after diluting with each distilled water (D.I water), 5% and 25% of nitric acid and, in case of selected wavelength, the wavelength that standard methods for the examination of water and device prefer was selected as top priority.
As the results of calculating the accuracy and precision against the measured values, the accuracy of Arsenic was 74.7% in wavelength of 228.812 nm in case of condition 3 and that of lead was 74.4% in wavelength of 261.417 nm in case of condition 3. Except for these, the accuracy of 75∼125% and standard deviation 25% against the precision that were suggested from standard methods for the examination of water were all satisfied. However, the case that analyzed with the same matrix could gain the better measured values than the case that was analyzed with different matrix. And there were the differences for each item along the concentration of acid though it was diluted with the same matrix.
Regarding wavelength, the similarity to true value fell as As of 228.812nm, Cd of 326.105nm and Pb of 261.417nm. The measured values of Cr, Cu and Mn were lower against the true value comparing to the rest 3 items. But the similar tendency was shown among the wavelengths of each item.
It was measured after making the matrix different. As, Cd are Pb similar in the same matrix regardless the concentration of acid. The measured values that analyzed Cr and Cu with the condition 1 appeared higher than the ones that analyzed it with the condition 5 and 9.
In case of diluting it with different matrix, the measured values got lower as the concentration of acid added to sample matrix in all items was higher. The measured values of As, Cd and Mn got higher as the concentration of acid added to matrix of standard solution got higher.
The measured values got higher in case the matrix that diluted the sample was 25% of nitric acid regarding Cr, Cu and Pb, and the measured values appeared the same in case of distilled water and 5% of nitric acid. And, in case of different matrix, the measured value of Cr, Cu and Pb were less influenced by the concentration of acid comparing to that of As, Cd and Mn.
It is the influence of wavelength and matrix for each item against the measured values. In case of As, Cd and Pb, the measured values that analyzed the same matrix (condition 1, 5 and 9) was similar to the true value. But the measured values that analyzed it with different matrix (condition 2, 3 and 6) were more similar to the true value than the measured values that analyzed it with the same matrix (condition 5 and 9).
As the results, the measured values that analyzed it with the same matrix was more similar to the true value than the measured values that analyzed it with the different matrix in case of analyzing 6 items of As, Cd, Cr, Cu and Mn simultaneously. And the analysis with 5% of Nitric acid can gain the better results than distilled water with 25% of Nitric acid. However, it should be analyzed by considering the influence of diluting matrix by classifying As, Cd, Cr, Cu and Mn in order to get the better results.
And the measure values of Cr and Mn were not influenced by the wavelength largely. The wavelength of 228.812 nm should not be used for As and that of 326.105 nm should not be used for Cd. It would be good to analyze it by using 324.754 nm and 327.395 nm for Cu, 220.353 nm for Pb.
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