scholarly journals Impact of commonly used Ag-Cu ion doses on Desulfovibrio sp.: growth and microbiologically induced corrosion against stainless steel

2020 ◽  
Vol 82 (5) ◽  
pp. 940-953
Author(s):  
S. Arkan-Ozdemir ◽  
N. Cansever ◽  
E. Ilhan-Sungur
Keyword(s):  
Stainless Steel ◽  
Corrosion Rate ◽  
Inductively Coupled Plasma ◽  
Extracellular Polymeric Substances ◽  
Cooling Water ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Microbiologically Induced Corrosion ◽  
Cu Ions

Abstract Ag-Cu ions in cooling water may inhibit the activity of sulfate-reducing bacteria and therefore provide solutions to microbiologically induced corrosion (MIC) problems, mainly caused by Desulfovibrio sp. To investigate this, the MIC behavior of Desulfovibrio sp. on 316L stainless steel in terms of growth and extracellular polymeric substances (EPS) production was investigated in the presence of Ag-Cu ions. Laboratory-scale systems were set up with final concentrations of 0.13 ppm Ag and 0.3 ppm Cu ions, as they are the frequently used doses for cooling waters, and operated over 720 hours. The corrosion rate was evaluated by gravimetric assay, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analyses. The growth of Desulfovibrio sp. was assessed by bacterial counting and EPS production. Ag-Cu ions in the biofilm were assessed by inductively coupled plasma - optical emission spectrometry (ICP-OES) and EDS-elemental mapping analyses. It was concluded that the ion concentrations used caused an increase in EPS production, especially of protein. The corrosion rate of the metal by Desulfovibrio sp. in the presence of ions was detected as being 29 times higher than that in the sterile medium with the ions after 720 hours. The results suggested that Desulfovibrio sp. exhibited more corrosive behavior in the presence of non-toxic concentrations of Ag-Cu ions.

Direct determination of trace elements in austenitic stainless steel samples by ETV-ICPOES

2016 ◽  
Vol 31 (12) ◽  
pp. 2434-2440 ◽  
Author(s):  
Guilherme L. Scheffler ◽  
Adam J. Brooks ◽  
Zhongwen Yao ◽  
Mark R. Daymond ◽  
Dirce Pozebon ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Inductively Coupled Plasma ◽  
Direct Determination ◽  
Optical Emission ◽  
Direct Analysis ◽  
Emission Spectrometry ◽  
Electrothermal Vaporization ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectrometry

Electrothermal vaporization (ETV) coupled to inductively coupled plasma optical emission spectrometry (ICPOES) was applied to the direct analysis of austenitic stainless steel powders using external calibration with increasing amounts of urban particulate matter (NIST 1648a) certified reference material.

Advances in sample digestion using microwave-ultraviolet radiations: phosphorus and sulfur determination in animal feed

2020 ◽  
Vol 16 ◽  
Author(s):  
Diogo L. R. Novo ◽  
Priscila T. Scaglioni ◽  
Rodrigo M. Pereira ◽  
Filipe S. Rondan ◽  
Gilberto S. Coelho Junior ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Animal Feed ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Official Method ◽  
Dissolved Carbon ◽  
Inductively Coupled ◽  
Relative Standard ◽  
Wide Range ◽  
Sulfur Determination

Background: Conventional analytical methods for phosphorus and sulfur determination in several matrices present normally analytical challenges regarding inaccuracy, detectability and waste generation. Objective: The main objective is proposing a green and feasible analytical method for phosphorus and sulfur determination in animal feed. Methods: Synergic effect between microwave and ultraviolet radiations during sample preparation was evaluated for the first time for the animal feed digestion associated with further phosphorus and sulfur determination by ion chromatography with conductivity detection. Dissolved carbon and residual acidity in final digests were used for the proposed method assessment. Phosphorus and sulfur values were compared with those obtained using conventional microwave-assisted wet digestion in closed vessels associated with inductively coupled plasma optical emission spectrometry and with those obtained using Association of Official Analytical Chemists International official method. Recovery tests and certified reference material analysis were performed. Animal feeds were analyzed using the proposed method. Results: Sample masses of 500 mg were efficiently digested using only 2 mol L -1 HNO3. The results obtained by the proposed method was not differing significantly (p > 0.05) from those obtained by the conventional and official methods. Suitable recoveries (from 94 to 99%), agreement with certified values (101 and 104%) and relative standard deviations (< 8%) were achieved. Phosphorus and sulfur content in commercial products varied in a wide range (P: 5,873 to 28,387 mg kg-1 and S: 2,165 to 4,501 mg kg-1 ). Conclusion: The proposed method is a green, safe, accurate, precise and sensitive alternative for animal feed quality control.

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