UV Spectrophotometry as a Non-parametric Measurement of Water and Wastewater Quality Variability

2005 ◽  
Vol 40 (1) ◽  
pp. 51-58 ◽  
Author(s):  
Olivier Thomas ◽  
Estelle Baurès ◽  
Marie-Florence Pouet
Keyword(s):  
Physicochemical Parameters ◽  
Weather Conditions ◽  
Uv Spectra ◽  
Uv Spectrophotometry ◽  
Dilution Factor ◽  
Uv Absorption Spectra ◽  
Wastewater Quality ◽  
Water And Wastewater ◽  
Non Parametric

Abstract The composition of water and wastewater, varying temporally and spatially, depends on factors such as environmental context, types of pollution sources, weather conditions leading to dilution or solids transportation, length of sewer network, etc. Because quantitative parameters are often not adapted for the characterization of wastewater quality variability, a non-parametric measurement is proposed, based on comparison of the UV absorption spectra of samples. The presence of isosbestic points, occurring in the set of spectra either directly or indirectly after normalization, allows quantification of the variability of a given water or effluent. A normalization step is used when dilution exists in the case of a mixture of water types (discharge or rain). Several examples show how to calculate the variability or to estimate the dilution factor from UV spectra data, even without results of physicochemical parameters.

Minimisation strategy of petrochemical wastewater organic load

2000 ◽  
Vol 42 (5-6) ◽  
pp. 15-22 ◽  
Author(s):  
H. El Khorassani ◽  
P. Trebuchon ◽  
H. Bitar ◽  
O. Thomas
Keyword(s):  
Industrial Wastewater ◽  
Uv Spectra ◽  
Waste Minimization ◽  
Organic Load ◽  
Wastewater Management ◽  
Uv Spectrophotometry ◽  
Petrochemical Wastewater ◽  
Waste Production

Industrial wastewater management is nowadays a reality in most industries and particularly in petrochemical ones. As a consequence, some treatment plants appear to be over designed because of waste minimization. Actually supplementary organic loads coming from incidents or external effluents have to be treated. As classical parameters or compound analyses are not well adapted, a new methodology based on the use of UV spectrophotometry is proposed. Starting from several samplesof wastewater in different points of sewage network, a procedure, called UVDIAG is used for the exploitation of the corresponding UV spectra. Some complementary measurements such as pH or conductivity can be carried out. This methodology allows a better characterization of wastewater including the detection of incidents and most often the determination of the major pollutant(s). Several months of application in a large petrochemical site located in the south of France have lead to a better knowledge of the waste production andthus to the reduction of organic load to be treated. At the same time, the company has decided to consider external wastes for treatment and to check the effluent conformity with the proposed procedure.

scholarly journals Characterization of Multifloral Honeys from Angola by Their Physicochemical Parameters

2018 ◽  
Vol 7 (2) ◽  
pp. 1869-1875
Author(s):  
Vanya Manolova ◽  
Ivayla Parvina ◽  
Todorka Yankovska Stefanova ◽  
Elissaveta Luchanska ◽  
Ralitsa Balkanska
Keyword(s):  
Physicochemical Parameters

scholarly journals Isolation Detection and Characterization of Syringolin A produced from the Probiotic Strain Bacillus Cereus Isolated from Donkey Milk

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Rashmi D ◽  
Sharmila T ◽  
Sushama Patil ◽  
Onkar Apine ◽  
Srinivas Sistla ◽  
...  
Keyword(s):  
Probiotic Strain ◽  
Uv Spectra ◽  
Organic Layer ◽  
Characteristic Peak ◽  
Antitumor Compound ◽  
Solvent Systems ◽  
Culture Supernatants ◽  
Layer Chromatography ◽  
Economical Process

Syringolin A is a non-ribosomal virulence factor secreted by few Pseudomonas strains. Syringolin A is an well known irreversible proteasome inhibitor and antitumor compound. The present study is focused on the extraction of Syringolin A through a non-tedious and economical process. Syringolin A is extracted from culture supernatants by the immiscible organic layer by mixing of dichloromethane or chloroform (trichloromethane). Syringolin A was identified by the characteristic peak at 350 nm by UV spectra. The compound was further characterized by Thin Layer Chromatography (TLC) with the retention value, Rf was found to be in the range of 0.78-0.83 run using a combination of solvent systems water and methanol.  The molecular weight of the compound was found to be 492.2614 g mol-1 identified and analyzed by UHPLC–QTOF-MS analysis. Due to its significant pharmacological importance in proliferative diseases, further studies on production and optimization of these compounds are necessary.   

scholarly journals THE CHARACTERIZATION OF HEADACHE IN PATIENTS WITH DYSCIRCULATORY ENCEPHALOPATHY OF DIFFERENT GENESIS

2020 ◽  
Vol 73 (6) ◽  
pp. 1241-1244
Author(s):  
Olena V. Litvin ◽  
Anatolii M. Kravchenko ◽  
Oleksandr V. Klymenko ◽  
Maksym M. Lytvyn ◽  
Liliana V. Klymenko
Keyword(s):  
Arterial Hypertension ◽  
Weather Conditions ◽  
Study Groups ◽  
Root Area ◽  
Cerebral Atherosclerosis ◽  
Dyscirculatory Encephalopathy ◽  
Significant Difference ◽  
Apparent Reason

The aim of the study was to study the headache features in patients with dyscirculatory encephalopathy of different genesis. Materials and methods: Clinical-neurological and clinical-instrumental examination of 90 persons aged 40 to 68 was performed. The first group consisted of 60 patients with dyscirculatory encephalopathy and arterial hypertension (DE and AH), the second group – 30 patients with dyscirculatory encephalopathy and cerebral atherosclerosis (DE and CA). Results: In the study of headache in patients with DE + AH and DE + CA, the frequency of detection, the intensity on the VAS scale, and the nature of the headache, no significant difference was found between study groups. Conclusions: According to the results of the study, it was proved that patients with DE + CA had headache in the root area, with the circumstances of headache being significantly outweighed «for no apparent reason» (p = 0.007) and with changing weather conditions (р = 0.001). Arterial hypertension was a major factor in headache (p = 0.008) and in patients with DE + AH.

scholarly journals Ultraviolet Spectroscopy Used to Fingerprint Five Wild-Grown Edible Mushrooms (Boletaceae) Collected from Yunnan, China

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Yan Li ◽  
Ji Zhang ◽  
Tao Li ◽  
Tianwei Yang ◽  
Yuanzhong Wang ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
Discriminant Analysis ◽  
Hierarchical Cluster Analysis ◽  
Visual Discrimination ◽  
Uv Spectroscopy ◽  
Hierarchical Cluster ◽  
Uv Spectra ◽  
Edible Mushrooms ◽  
Ultraviolet Spectroscopy

Nowadays, wild-grown edible mushrooms which are natural, nutritious, and healthy get more and more popular by large consumers. In this paper, UV spectra of different Boletaceae mushrooms with the aid of partial least squares discriminant analysis (PLS-DA) and hierarchical cluster analysis (HCA) were shown to be a practical and rapid method for discrimination purpose. The specimens of Boletus edulis, Boletus ferrugineus, Boletus tomentipes, Leccinum rugosiceps, and Xerocomus sp. were described based on the UV spectra. From the results, all the specimens were characterized by strong absorption at the wavelengths of 274 and 284 nm and showed the shoulder at 296 nm. However, changes could be seen in the peak heights at the same wavelength for different samples. After analyzing by chemometrics, visual discrimination among samples was presented and the relationships among them were also obtained. This study showed that UV spectroscopy combined with chemometrics methods could be used successfully as a simple and effective approach for characterization of these five wild-grown edible mushrooms at species and genus levels. Meanwhile, this rapid and simple methodology could also provide reference for the discrimination of edible mushrooms.

Synthesis and Characterization of Reactive Michler's Ketones

2013 ◽  
Vol 818 ◽  
pp. 54-57
Author(s):  
Qing Hua Huang ◽  
Xiao Qing Dou ◽  
Xiong Xiong Bai ◽  
Zhong Yu Hu ◽  
Chuan Jie Cheng
Keyword(s):  
Absorption Spectra ◽  
Uv Absorption ◽  
Synthesis And Characterization ◽  
Uv Absorption Spectra

Two novel reactive Michlers ketones were designed and easily synthesized in moderate yields. UV-absorption spectra showed that the reactive Michlers ketones absorbed light more efficiently than their bromide reactants. In practice, the Michlers ketones can act as both a photoinitiator and a co-photoinitiator to produce UV-cured cardanol resin in the absence of any other photoinitiators and co-photoinitiators.

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