Determination of H2O2and organic peroxides in cloud-and rain-water on the Kleiner Feldberg during FELDEX

1996 ◽  
Vol 23 (19) ◽  
pp. 2605-2608 ◽  
Author(s):  
F. Sauer ◽  
G. Schuster ◽  
C. Schäfer ◽  
G. K. Moortgat
Keyword(s):  
Rain Water ◽  
Organic Peroxides ◽  
Kleiner Feldberg

Correction to “Determination of H2O2and organic peroxides in cloud- and rain-water on the Kleiner feldberg during FELDEX”

1997 ◽  
Vol 24 (7) ◽  
pp. 827-827 ◽  
Author(s):  
F. Sauer ◽  
G. Schuster ◽  
C. Schäfer ◽  
G. K. Moortgat
Keyword(s):  
Rain Water ◽  
Organic Peroxides ◽  
Kleiner Feldberg

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.

scholarly journals Direct spectrophotometric determination of traces of fluoride in rain water

2003 ◽  
Vol 52 (6) ◽  
pp. 485-488 ◽  
Author(s):  
Minoru OKUMURA ◽  
Tomohiro YOSHIMURA ◽  
Kaoru FUJINAGA ◽  
Yasushi SEIKE
Keyword(s):  
Spectrophotometric Determination ◽  
Rain Water

Determination of Organic Peroxides by Reaction with Ferrous Iron

1951 ◽  
Vol 23 (4) ◽  
pp. 595-603 ◽  
Author(s):  
I. M. Kolthoff ◽  
A. I. Medalia
Keyword(s):  
Ferrous Iron ◽  
Organic Peroxides

Determination of organic acids by ion chromatography in rain water in the State of Zulia, Venezuela

1994 ◽  
Vol 671 (1-2) ◽  
pp. 193-196 ◽  
Author(s):  
José A. Morales ◽  
Hilda L. de Medina ◽  
Marlene G. de Nava ◽  
Harvi Velásquez ◽  
Magaly Santana
Keyword(s):  
Organic Acids ◽  
Ion Chromatography ◽  
The State ◽  
Rain Water

scholarly journals Sensitive Spectrophotometric Determination of Nitrite in Human Saliva and Rain Water and of Nitrogen Dioxide in the Atmosphere

2001 ◽  
Vol 84 (1) ◽  
pp. 53-58 ◽  
Author(s):  
Murad I H Helaleh ◽  
Takashi Korenaga
Keyword(s):  
Nitrogen Dioxide ◽  
Azo Dye ◽  
Reference Method ◽  
Ph Control ◽  
Human Saliva ◽  
Molar Absorptivity ◽  
Rain Water ◽  
Relative Standard ◽  
Time Required

Abstract A new simple, sensitive, and selective spectrophotometric method was developed for the determination of nitrite. The method is based on the reaction of nitrite with sulfathiazole in acidic medium to form a diazonium cation, which is subsequently coupled with N-(1-naphthyl)ethylenediamine dihydrochloride to form a highly stable, violet azo dye. The reaction product has an absorption maximum at 546 nm and obeys Beer's law over a nitrite range of 0.054–0.816 μg/mL. The molar absorptivity of the colored compound is 4.61 × 104 L/(mol·cm). The detection limit is 12.1 μg/L. The relative standard deviation is 0.85% for 5 determinations of nitrite at 0.27 μg/mL. The reproducibility and validity of the proposed method are discussed in the present paper. The simplicity of the method is demonstrated by the high stability of the azo-dye product as well as the short time required for its complete formation in a reaction at room temperature without pH control or extra extraction. The sensitivity of the method is shown by the successful determination of nitrite in human saliva and rain water, and of nitrogen dioxide in the atmosphere. The results compare favorably with those obtained by the reference method. The selectivity of the method is indicated by its freedom from most interferences, even at high concentrations of nitrate (500 μg/mL).

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