A simple visual method for the determination of phosphorus in environmental waters

1987 ◽  
Vol 328 (3) ◽  
pp. 251-254 ◽  
Author(s):  
Hiroshi Hashitani ◽  
Minoru Okumura
Keyword(s):  
Environmental Waters ◽  
Visual Method

Kinetic fluorimetric determination of trace hydrazine in environmental waters

2006 ◽  
Vol 86 (13) ◽  
pp. 995-1005 ◽  
Author(s):  
Jing Fan ◽  
Jichuan Kong ◽  
Suling Feng ◽  
Jianji Wang ◽  
Pingan Peng
Keyword(s):  
Environmental Waters ◽  
Fluorimetric Determination

scholarly journals Determination of dimethoate, 2,4-dichlorophenoxy acetic acid, mecoprop and linuron pesticides in environmental waters in Republic of Macedonia by high performance liquid chromatography

2008 ◽  
Vol 27 (1) ◽  
pp. 25 ◽  
Author(s):  
Aleksandra Nestorovska-Krsteska ◽  
Meri Mirčeska ◽  
Jean-Jacques Aaron ◽  
Zoran Zdravkovski
Keyword(s):  
Acetic Acid ◽  
Solid Phase Extraction ◽  
High Performance ◽  
Solid Phase ◽  
Sampling Period ◽  
Phase Extraction ◽  
Environmental Waters ◽  
Spe Method ◽  
Dichlorophenoxy Acetic Acid

An HPLC-UVDAD method for determination of dimethoate, 2,4-dichlorophenoxy acetic acid (2,4-D), mecoprop (MCPP) and linuron in environmental waters was developed. The water samples were concentrated and extracted by a solid phase extraction (SPE) method on Bond Elut PPL cartridges. After extraction the investigated compounds were separated on Stability RP Pesticides chromatographic column using mobile phase composed of acetonitrile- water-acetic acid in volume fractions of 39:59:2 and flow rate of 0.7 mL/min. Ultraviolet absorption detection was carried out for dimethoate, 2,4-D and MCPP at 229 nm, and for linuron at 249 nm. Recoveries made from 500 mL of drinking waters using solid phase extraction ranged between 64.3–92.1 %. The method was applied to environmental waters in Macedonia that receive runoffs from agriculture lands. The levels of pesticides under study ranged between 0.31 μg/L and 7.05 μg/L, depending on the compound and sampling period.

Multi-Criteria Analysis in Assessment of the Degree of Degradation Pavement Elements Functional Airports Made of Cement Concrete

2017 ◽  
Author(s):  
Mariusz Wesołowski ◽  
Krzysztof Blacha ◽  
Piotr Barszcz
Keyword(s):  
Quality Management System ◽  
Technical Condition ◽  
Cement Concrete ◽  
Functional Elements ◽  
Surface Degradation ◽  
Visual Method ◽  
Flight Operations ◽  
Multi Criteria Analysis ◽  
Degree Of Degradation

An important factor that affects the safety of flight operations is the proper management of airports, which should be based on the obtained in systematic way information about the state of the surface of the functional elements. One of the characteristic quantities of the technical condition of airport indicator is the assessment of the degree of degradation. It should be noted that the degradation is a slow process extended in time and is the lowering of the properties of the structure by external influences, which in turn generates the changes in their structure. Rating degrade surface should be conducted periodically, which period shall be estimated on the basis of information obtained from the process of the operation of aircraft. Demotions surface is determined on the basis of the type and quantity survey found damage and made repairs. The basis for evaluating the degree of surface degradation is to obtain data from surveys conducted using the method of visual and inventory of them. Research by visual method, despite its apparent simplicity, it is difficult to implement. Qualification of damage or repairs to the appropriate group is often not clear, and therefore the inventory process is described in the documentation of quality management system. The multi-criteria analysis is a method of evaluating the weighted supporting estimating the degree of degradation airfield pavements based on data obtained through inspections performed. Its base is included in the determination of a number of criteria for the selection variant, taking into account different weights to each criterion. The value of the indicator characterizing the degree of surface degradation in relation to estimated criteria allows you to schedule the necessary resources needed to carry out repairs and rational planning of repairs.

scholarly journals Multi-residue enantioselective determination of emerging drug contaminants in seawater by solid phase extraction and liquid chromatography-tandem mass spectrometry

2020 ◽  
Vol 12 (22) ◽  
pp. 2881-2892
Author(s):  
Katie McKenzie ◽  
Colin F. Moffat ◽  
Bruce Petrie
Keyword(s):  
Mass Spectrometry ◽  
Liquid Chromatography ◽  
Solid Phase ◽  
Tandem Mass ◽  
Phase Extraction ◽  
Environmental Waters ◽  
Chiral Drugs ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass

This is the first enantioselective method for profiling chiral drugs in saline environmental waters (30–35 practical salinity units).

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