scholarly journals Direct Determination of Atrazine Residue on Chinese Cabbage Leaf Using Desorption Electrospray Ionization-Tandem Mass Spectrometry and Its Application for Diagnosing Atrazine Drift Phytotoxicity

2009 ◽  
Vol 92 (5) ◽  
pp. 1587-1592 ◽  
Author(s):  
Xin-Zhong Zhang ◽  
Chong-Jiu Li ◽  
Shan-Shan Chen ◽  
Xiao-Juan Li ◽  
Hao Han ◽  
...  
Keyword(s):  
Electrospray Ionization ◽  
Chinese Cabbage ◽  
Good Accuracy ◽  
Ion Trap ◽  
Desorption Electrospray Ionization ◽  
Direct Determination ◽  
Surface Concentration ◽  
Relationship Of ◽  
Average Peak Area

Abstract A method was developed for the determination of atrazine residue and phytotoxicity on a nontargeted plant, the Chinese cabbage. The analysis was done by desorption electrospray ionization combined with ion trap MS/MS. Within the range of 63.13 to 2525 pg/mm2 of atrazine on the specimen, the linear relationship of the average peak area of extracted product ion m/z 174 (y) versus the surface concentration of atrazine (x) was estimated as y 5066.5x 85779; r was 0.9994, with RSD between 3.37 and 26.17. The LOQ of atrazine on the leaf surface was lower than 63.13 pg/mm2. The method is highly applicable to detect atrazine residue and evaluate atrazine phytotoxicity on Chinese cabbage leaf with good accuracy, selectivity, sensitivity, and specificity.

scholarly journals Trace detection of inorganic oxidants using desorption electrospray ionization (DESI) mass spectrometry

2011 ◽  
Vol 9 (5) ◽  
pp. 790-797 ◽  
Author(s):  
Ewa Sokol ◽  
Ayanna Jackson ◽  
R. Cooks
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Ionization ◽  
Matrix Effects ◽  
Sodium Perchlorate ◽  
Desorption Electrospray Ionization ◽  
Surface Concentration ◽  
Ambient Ionization ◽  
Hydrocarbon Mixture ◽  
Ionization Mass ◽  
Trace Detection

AbstractDesorption electrospray ionization (DESI), an established ambient ionization method in mass spectrometry (MS) for the analysis of organic compounds, is applied here to trace detection of inorganic salts, including inorganic oxidants. In-situ surface analysis of targeted compounds, including nitrogen-, halogen- and sulfur-salts, down to sub-nanogram levels, was performed using DESI-MS. Successful experiments were carried out in both the negative and the positive ion modes; simple anions and cations as well as small cluster ions were observed. Various surfaces are examined and surface porosity effects were briefly explored. Absolute detection limits on porous polytetrafluoroethylene (PTFE) of 120 pg (surface concentration 0.07 ng mm−2) and 50 pg (surface concentration 0.03 ng mm−2), were achieved for sodium chlorate and sodium perchlorate, respectively. The compounds of interest were examined in the presence of a hydrocarbon mixture to assess matrix effects: only a two- or three-fold decrease in the target ion intensity was observed. Commercial fireworks were analyzed to determine perchlorate salts in complex mixtures. This work demonstrates the potential applicability of ambient ionization mass spectrometry to forensic investigations involving improvised explosives.

scholarly journals Determination of sulfation pattern in brain glycosaminoglycans by chip-based electrospray ionization ion trap mass spectrometry

2009 ◽  
Vol 395 (8) ◽  
pp. 2489-2498 ◽  
Author(s):  
Corina Flangea ◽  
Catalin Schiopu ◽  
Eugen Sisu ◽  
Alina Serb ◽  
Michael Przybylski ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electrospray Ionization ◽  
Ion Trap ◽  
Ion Trap Mass Spectrometry ◽  
Sulfation Pattern

The Direct Determination of Oxygen in Rubber. The Adaptation of the Ter Meulen Method to Rubber and Its Application to the Study of Aging

1939 ◽  
Vol 12 (2) ◽  
pp. 269-282 ◽  
Author(s):  
H. I. Cramer ◽  
I. J. Sjothun ◽  
L. E. Oneacre
Keyword(s):  
Tensile Strength ◽  
Physical Properties ◽  
Direct Determination ◽  
Sulfur Poisoning ◽  
Oxidation Products ◽  
Oxygen Bomb ◽  
Vulcanized Rubber ◽  
Relationship Of ◽  
The Relationship

Abstract The ter Meulen method for the direct determination of oxygen has been adapted, with modifications, to the analysis of raw and vulcanized rubbers. Raney nickel has been found to be quite effective as the reducing catalyst and to be satisfactorily resistant to sulfur poisoning. The method has been applied to the study of the aging of vulcanized rubber in the Geer oven and oxygen bomb. From this study the following conclusions may be drawn: (1) The increase in combined oxygen is greater in the oxygen bomb than in the Geer oven. (2) Deterioration of rubber in the oxygen bomb involves oxidation primarily, whereas that occurring in the Geer oven involves not only oxidation but also thermal decomposition followed by volatilization of oxidation products. (3) The effectiveness of an antioxidant in retarding the absorption of oxygen in oxygen-bomb aging agrees well with its ability to maintain the physical properties of the stock in which it is present. (4) The deterioration in physical properties of a rubber stock in the oxygen bomb during the early stages of aging is a linear function of the increase in combined oxygen. For stocks containing antioxidants and diphenylguanidine as the accelerator, an increase in combined oxygen of approximately 1.2% corresponds to a decrease in tensile strength of 50%. (5) The relationship of increase in combined oxygen to decrease in tensile strength seems to be affected not only by antioxidants, but also by accelerators of vulcanization.

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