Determination of the effectiveness of UV radiation as a means of disinfection of metalworking fluids

2013 ◽  
Vol 64 (2) ◽  
pp. 831-838
Author(s):  
Ratul Saha ◽  
Robert S. Donofrio ◽  
Susan T. Bagley
Keyword(s):  
Uv Radiation ◽  
Metalworking Fluids

scholarly journals Possible values of UV index in Serbia

2008 ◽  
Vol 136 (11-12) ◽  
pp. 640-643 ◽  
Author(s):  
Milorad Letic
Keyword(s):  
Uv Radiation ◽  
The Sun ◽  
Total Column Ozone ◽  
Uv Index ◽  
Clear Sky ◽  
Expected Values ◽  
June July ◽  
Column Ozone ◽  
Ozone Column

INTRODUCTION UV Index is an indicator of human exposure to solar ultraviolet (UV) rays. The numerical values of the UV Index range from 1-11 and above. There are three levels of protection against UV radiation; low values of the UV Index - protection is not required, medium values of the UV Index - protection is recommended and high values of the UV Index - protection is obligatory. The value of the UV Index primarily depends on the elevation of the sun and total ozone column. OBJECTIVE The aim of the study is to determine the intervals of possible maximal annual values of the UV Index in Serbia in order to determine the necessary level of protection in a simple manner. METHOD For maximal and minimal expected values of total column ozone and for maximal elevation of the sun, the value of the UV Index was determined for each month in the Northern and Southern parts of Serbia. These values were compared with the forecast of the UV Index. RESULTS Maximal clear sky values of the UV Index in Serbia for altitudes up to 500m in May, June, July and August can be 9 or even 10, and not less than 5 or 6. During November, December, January and February the UV Index can be 4 at most. During March, April, September and October the expected values of the UV Index are maximally 7 and not less than 3. The forecast of the UV Index is within these limits in 98% of comparisons. CONCLUSION The described method of determination of possible UV Index values showed a high agreement with forecasts. The obtained results can be used for general recommendations in the protection against UV radiation.

scholarly journals Experimental analysis of chemical demulsification of cutting oil

2018 ◽  
pp. 28-37
Author(s):  
Piotr Pacholski ◽  
Jerzy Sęk
Keyword(s):  
Aluminum Sulfate ◽  
Low Cost ◽  
Metalworking Fluids ◽  
Optimal Dosage ◽  
Recycling Process ◽  
Lubricant Oil ◽  
Metalworking Fluid ◽  
Oil In Water ◽  
Oil Water

The wastewater produced by the metal industry is often present in the form of oil-in-water (O/W) or water-in- oil (W/O) emulsions. These fluids contain a certain amount of valuable oil that can be recovered in the recycling process. Therefore, the development of novel, efficient, and low cost processes for the treatment of metalworking fluid is necessary. Demulsification to separate oil/water mixtures is a very interesting option because it allows the recovery and reuse of the lubricant oil and effects in cleaner, easily treatablemwastewater.Chemical destabilization is the most common way of demulsification of metalworking fluids. As an example, inorganic salts can be used as demulsifiers. In the presented work the efficiency of treatment of cutting emulsions with chemical demulsification with usage of aluminum sulfate (IV) is described. The emulsion was prepared with Emulgol-ES12 self-emulsyfing oil delivered by Orlen S.A. In the research the feasibility of the demulsifier was checked.The novel in this paper is determination of the optimal dosage of emulsifier using the TurbiscanLab® apparatus. It is relatively quick and precise method that can be applied in the industry.

scholarly journals Use of Doehlert and constrained mixture designs in the development of a photo-oxidation procedure using UV radiation/H2O2 for decomposition of landfill leachate samples and determination of metals by flame atomic absorption spectrometry

2015 ◽  
Vol 87 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Marcos A. Bezerra ◽  
Antônio D.S. Souza ◽  
Rafael V. Oliveira ◽  
Djalma M. Oliveira ◽  
Luiz A.M. Cardoso ◽  
...  
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Uv Radiation ◽  
Flame Atomic Absorption Spectrometry ◽  
Landfill Leachate ◽  
Absorption Spectrometry ◽  
Photo Oxidation ◽  
Flame Atomic Absorption ◽  
Constrained Mixture

This work proposes the use of photo-oxidation degradation with UV radiation/H2O2 as sample treatment for the determination of Fe, Zn, Mn, Ni and Co in municipal solid waste landfill leachate by flame atomic absorption spectrometry (FAAS). Three variables (pH, irradiation time and buffer concentration) were optimized using Doehlert design and the proportions of mixture components submitted to UV radiation (leachate sample, buffer solution and H2O2 30%, v/v) were optimized using a constrained mixture design. Using the experimental conditions established, this procedure allows limits of detection of 0.075, 0.025, 0.010, 0.075 and 0.041 µg mL-1, and the precision levels expressed as relative standard (%RSD, 0.5 µg mL-1) were 3.6, 1.8, 1.3, 3.3 and 1.7%, for Fe, Mn, Zn, Ni and Co respectively. Recovery tests were carried out for evaluation of the procedure accuracy and recoveries were between 92 and 106% for the studied metals. This procedure has been applied for the analysis of the landfill leachate collected in Jequié, a city of the southwestern region of the State of Bahia, Brazil. The results were compared with those obtained by acid digestion. There was no significant difference between the results obtained by the two methods based on paired t-test at 95% confidence level.

Determination of N-Nitroso Compounds in the Environment of a Metal Factory Using Metalworking Fluids

1990 ◽  
Vol 39 (3) ◽  
pp. 281-288 ◽  
Author(s):  
Sami Fadlallah ◽  
Sam F. Cooper ◽  
Michel Fournier ◽  
Daniel Drolet ◽  
Guy Perrault
Keyword(s):  
Nitroso Compounds ◽  
Metalworking Fluids ◽  
Metal Factory

A greener alternative for inline nitrate reduction in the sequential injection determination of NOx in natural waters: replacement of cadmium reduction by UV radiation

2017 ◽  
Vol 9 (12) ◽  
pp. 1876-1884 ◽  
Author(s):  
Ana Machado ◽  
Graham Marshall ◽  
Adriano A. Bordalo ◽  
Raquel B. R. Mesquita
Keyword(s):  
Uv Radiation ◽  
Nitrate Reduction ◽  
Natural Waters ◽  
Sequential Injection ◽  
Uv Lamp

A green alternative is proposed for the in-line nitrate reduction using a UV lamp, aiming to avoid the use of cadmium, in a NOx SIA determination.

scholarly journals Polymer materials with controlled degradation time

2018 ◽  
Vol 44 ◽  
pp. 00122 ◽  
Author(s):  
Ewelina Niedzielska ◽  
Anna Masek
Keyword(s):  
Mechanical Properties ◽  
Uv Radiation ◽  
Color Change ◽  
Polymer Materials ◽  
Effect Of Temperature ◽  
Oxygen Effect ◽  
Cyclic Olefin Copolymer ◽  
Cyclic Olefin ◽  
Before And After

The aim of this work was carry out accelarated process of ageing for cyclic olefin copolymer ethylene – norbornene (Topas). The Topas cyclic olefin copolymer (COC) family characterize high transparency, excellent mechanical properties and low water permeability. The influence of external factors such as UV radiation, elevated temperature, oxygen effect and humidity causing degradation of polymer macroparticles was also investigated. The properties of the polymer before and after weathering and UV radiation were also compared. Degradability was examinated by measuring color change, FTIR spectrum analysis and determination of the ageing factor k. The tensile strength, elongation at break and hardness of composites by Shore A method were measured. The synergistic effect of temperature, humidity and UV radiation reduces the mechanical properties of the samples tested, while the interaction of only UV radiation on the samples causes a significant change color.

RP-UFLC Method for Estimation of Propafenone in Tablets

2014 ◽  
Vol 7 (4) ◽  
pp. 2671-2676
Author(s):  
Sagar Suman Panda ◽  
Ravi Kumar B V V ◽  
Sasmita Kumari Acharjya ◽  
Kalyani Sahu
Keyword(s):  
Uv Radiation ◽  
Flow Rate ◽  
Retention Time ◽  
Mobile Phase ◽  
Correlation Coefficients ◽  
Tablet Formulation ◽  
Forced Degradation ◽  
Recovery Study ◽  
Isocratic Mode

A simple, precise and accurate RP-UFLC method was developed for determination of propafenone hydrochloride. Separation was carried on an Enable C18G column       (250 mm × 4.6 mm i.d., 5 μm) using methanol: 10 mM TBAHS (95:05, v/v) as mobile phase at flow rate of 1.0 ml/min in isocratic mode. The PDA detection wavelength was 247 nm. The retention time of propafenone was 2.692 min. The method was validated for linearity, specificity, precision, accuracy and robustness as per ICH. The method was linear in the concentration range of 10 – 250 µg/ml with correlation coefficients of 0.999. The LOD and LOQ were 4.5 µg/ml and 9.75 µg/ml, respectively. Average recoveries for recovery study were found to be in the range of 99.73-100.58. R.S.D. values for intraday, interday and system precision were found to be less than 2%. Specificity was established after forced degradation was performed by using HCl, NaOH, H2O2, thermal and UV radiation. The method was applied successfully for estimation propafenone in tablet formulation.   

Sign in / Sign up

Export Citation Format

Share Document