Test Method for Determination of Hydrogen Peroxide and Combined Organic Peroxides in Atmospheric Water Samples by Peroxidase Enzyme Fluorescence Method

10.1520/d6363 ◽  
2008 ◽  
Author(s):  
Keyword(s):  
Hydrogen Peroxide ◽  
Water Samples ◽  
Fluorescence Method ◽  
Test Method ◽  
Organic Peroxides ◽  
Atmospheric Water ◽  
Peroxidase Enzyme

Analysis of Acetone Peroxide Premixes for Bleaching and Maturing Flour

1964 ◽  
Vol 47 (2) ◽  
pp. 363-366
Author(s):  
James T Taylor
Keyword(s):  
Hydrogen Peroxide ◽  
Qualitative Method ◽  
Collaborative Study ◽  
Organic Peroxides ◽  
Dilute Sulfuric Acid ◽  
Quantitative Analyses ◽  
Single Determination ◽  
Acetone Peroxide ◽  
Qualitative Analyses

Abstract A quantitative and a qualitative method for the determination of acetone peroxides were subjected to collaborative study. Quantitative analyses are based upon liberation and titration of hydrogen peroxide from acyclic peroxides and hydroperoxides by dilute sulfuric acid and standardized potassium permanganate, respectively. Single determination of 6 samples (varying in per cent levels of peroxide equivalent) each of baking premixes and milling premixes produced very good collaborative results. Qualitative analyses, achieved by comparing infrared spectra of acetone-extracted organic peroxides with acetone-extracted organic peroxides from a reference premix, gave peaks characteristic of the premixes. No interferences were seen from various starch blanks. Both the quantitative and the qualitative methods are recommended for adoption as official, first action.

A Comparative Study on the Analysis Methods for Chlorophyll-a

2013 ◽  
Vol 726-731 ◽  
pp. 1411-1415 ◽  
Author(s):  
Fei Peng ◽  
Shi Bo Liu ◽  
Hai Yan Xu ◽  
Zhi Qun Li
Keyword(s):  
Detection Limit ◽  
Chlorophyll A ◽  
Water Samples ◽  
Chlorophyll A Fluorescence ◽  
Standard Procedure ◽  
Fluorescence Method ◽  
Monitoring Method ◽  
Detection Range ◽  
Analysis Methods

This paper investigated three chlorophyll-a analysis methods in water sample. The UV-VIS spectrophotometry method followed SL88-2012 standard procedure, the results showed the detection limit of chlorophyll-a was 0.22 μg/L, with the lower detection limit of 1.0 μg/L. The detection range of the vivo chlorophyll-a fluorescence method was 0.1-300μg/L, the ratios of different algae matched that prepared in water samples. The detection limits and quantification limits for HPLC by using UVD and FLD were respectively 0.013 and 0.004 μg/L, 0.040 and 0.013μg/L. FLD was more sensitive than UVD for chlorophyll-a analysis, and the recovery of standard addition was in the range of 90.2% to 103.9% with UVD and FLD. Given the different pretreatment procedures of the sample, equipment conditions, correction and precision, vivo chlorophyll-a fluorescence method was the best on-site monitoring and the emergency monitoring method. Spectrophotometer was suitable for routine laboratory determination of chlorophyll-a, especially for bulk water samples. HPLC method had high precision and sensitivity, so this method applied to the determination of exact requirements, microanalysis and pigment separation.

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