K. Popov Articles | Environmental XPRT

Determination of K shell parameters of silver using high resolution HPGe detector spectrometer

The K shell parameters such as K shell photoelectric cross–section at K shell binding energy, K shell jump ratio, K shell jump factor, the Davisson–Kirchner ratio and K shell oscillator strength of silver have been determined using high resolution HPGe detector coupled to 16K multichannel analyser. In this method the K X–ray photons in the energy region from 8 to 52 keV are ...

Feb. 20, 2013

By Inderscience Publishers

Nitrogen determination in diphtheria and tetanus toxoids according to Pharmacopoeia using back titration and boric acid titration

KjelMaster System K-375 / K-376, KjelDigester K-449, Scrubber K-415 Nitrogen and total protein determination in pharmaceutical products are described in the European Pharmacopoeia (Ph. Eur.) and in the Pharmacopoeia of the United States (USP). Therein, different titration techniques are specified. The Ph.Eur. is using back titration in the presence of the indicator methyl red mixed solution and ...

Aug. 9, 2017

By BÜCHI Labortechnik AG

Determination of Ammonia and Nitrogen

Customer: CAE Grand Ouest, France CAE is a laboratory of the Veolia Group located in Western France. The laboratory is specializing in environmental analysis, especially in water and soil analysis. Application: Determination of Ammonia and TKN in waste water and soil Total Kjeldahl Nitrogen (TKN) and Ammonia are common parameters for the evaluation of the pollution of soil and water. The ...

Jul. 6, 2013

By BÜCHI Labortechnik AG

Public awareness and safeguarding traditional knowledge: challenges and conflicts in preserving and representing kārīz/kănérjĭng in Xinjiang, PR China

Strategies of stimulating public awareness and implementing measures to safeguard traditional knowledge of the water management techniques generally known under the terms qanāt or kārīz involve paths of imbedding the technique into the history of a given society. The present study approaches such strategies in the case of the underground water networks in the arid regions ...

Oct. 16, 2014

By IWA Publishing

In Situ Remediation Technology Status Report: Co-Solvents

ABSTRACT The purpose of this document is to describe recent field demonstrations, commercial applications, and research on technologies that either treat soil and ground water in place or increase the solubility and mobility of contaminants to improve their removal by pump-and-treat remediation. It is hoped that this information will allow more regular consideration of new, less costly, and more ...

Jan. 1, 1995

By Groundwater Remediation Technologies Analysis Center

Development of Final Sedimentation Tank Maximum Operating Capacity Curves Using Vesilind Settling Parameters and Mathematical Modeling

New advances in development of maximum operating capacity curves using final sedimentation tank (FST) computational fluid dynamic (CFD) package – High Accuracy Clarifier Model (HACM©) and Vesilind settling parameters (Vo and k) were successfully applied in a recent project at the Sai Kung Sewage Treatment Works of the Drainage Services Department (DSD) in Hong Kong. The advances consist of more ...

Oct. 21, 2006

By Water Environment Federation (WEF)

Nitrogen analysis of pharmaceutical excipients

Customer: Butterworth Laboratories, United Kingdom Wilh nearly 40 years' experience, Butterworth Laboratories remains an independent UK con¬tract analytical service providing Method Development, Method Validation, Stability Testing and OC Testing to the pharmaceutical, medical device and chemical industries. They work in part¬nership with clients who not only recognize expertise in ...

Jul. 6, 2013

By BÜCHI Labortechnik AG

Temperature effect on ion exchange equilibrium between CMX membrane and electrolytes solutions

Ion exchange equilibrium for three systems involving monovalent and divalent ions has been investigated over various temperatures (283, 298 and 313 K) using CMX cationic exchange membrane. All experiments were carried out at 0.1 mol/L. Ion exchange isotherms for the binary systems (Na+/K+), (Na+/Ca2+) and (K+/Ca2+) were established at temperatures ranging from 283 to 313 K. The obtained ...

Jun. 5, 2015

By IWA Publishing

Oxocarbon Salts for Fast Rechargeable Batteries

Oxocarbon salts (M2(CO)n) prepared through one-pot proton exchange reactions with different metal ions (M=Li, Na, K) and frameworks (n=4, 5, 6) have been rationally designed and used as electrodes in rechargeable Li, Na, and K-ion batteries. The results show that M2(CO)5/M2(CO)6 salts can insert two or four metal ions reversibly, while M2(CO)4 shows less electrochemical activity. Especially, we ...

Sep. 8, 2016

By SusChem

The influence of wall temperature on NO₂ removal and HONO levels released by indoor photocatalytic paints

Abstract Photocatalytic paints represent a promising remediation technology that has potential to be applied in mechanically ventilated buildings to improve indoor air quality. The photocatalytic paints are typically used to eliminate the gas-phase pollutants, like nitrogen oxides (NOx) and volatile organic compounds (VOCs). Here, we demonstrate that indoor photocatalytic paints which contain ...

Jul. 15, 2017

By ECO Physics AG

The use of kaolinite/zeolite mixtures for landfill liners

The use of kaolinite/zeolite mixtures as alternative landfill materials has been studied. The ratios of kaolinite/zeolite used were K/Z = 0.1, K/Z = 0.2 and K/Z = 0.3. To determine the geotechnical and physicochemical properties of the mixtures, their optimum moisture content, which provides the best compression out in the field, was determined by a compaction test. Also, tests for unconfined ...

Aug. 22, 2005

By Inderscience Publishers

K series helical gear right angle gearbox for gear manufacturing

一. K series reducer overviewThe k series right angle gearbox for gear manufacturing is a combination of multi-stage helical gears, which is more efficient than single-stage worm gear reducers.The k series reducer is designed on the basis of the modular combination system. It has a very large number of motor combinations, installation positions and structural solutions. It has high double torque ...

Nov. 11, 2018

By NER Group Co.,Limited

Pre-reduction and K loading effects on noble metal free Co-system catalyst for water gas shift reaction

Water gas shift (WGS) reaction is an important reaction for carbon monoxide removal, and the catalysts for the reaction have been investigated over the past three decades. Although many researches have revealed that noble metals enhance the activity of WGS catalysts, the price of these metals creates concerns. This is why noble metal free catalyst is required for water gas shift reaction. We ...

Feb. 25, 2021

By Hiden Analytical Ltd.

Selective nitrogen determination methods related to Kjeldahl

KjelMaster System K-375 / K-376, KjelDigester K-449, Scrubber K-415 85 % of the world’s nitrogen demand for fertilizer is primarily derived from ammonia in the form of urea, ammonium nitrate, phosphate and sulfate. Ammoniacal components can also be found in soil, sludge and bio waste. In those sample matrices, a mixture of several nitrogen containing compounds as urea, nitrogen from other ...

Jan. 9, 2017

By BÜCHI Labortechnik AG

Removal and recovery of N, P and K from urine via ammonia stripping and precipitations of struvite and struvite-K

This study investigated the recovery of N, P and K from source-separated urine in laboratory-scale combined processes of air stripping and precipitation. Two operation scenarios were carried out to recover N/P (named partial scenario) and N/P/K (named complete scenario). Most of the nutrients were recovered (>70%) by optimising the operation parameters including the increase of air flow ...

Oct. 26, 2016

By IWA Publishing

Accelerated anaerobic release of K, Mg and P from surplus activated sludge for element recovery and struvite formation inhibition

Accelerated release of potassium (K), magnesium (Mg) and phosphorus (P) from surplus activated sludge (SAS) was investigated to develop a new system for the recovery of the elements. Anaerobic cultivation of SAS during 24 h released 78% of K and about 50% of Mg and P from SAS more effectively compared to aerobic cultivation (K: 40%, Mg: 15%, P: 15%). Furthermore, the addition of sodium ...

Feb. 20, 2017

By IWA Publishing

TKN determination in water and waste water

Determination of TKN (Total Kjeldahl Nitrogen) in Water and Waste Water according to the Kjeldahl Method. The determination of TKN in water and waste water is a routine procedure for quality assurance. A simple and fast procedure for the TKN determination in water, according to ISO 5663, AOAC 973.48 and EPA 351.3, is introduced below. The sample is digested with sulfuric acid and the Kjeldahl ...

Sep. 9, 2013

By BÜCHI Labortechnik AG

Potato Processor Flume Water Treatment Case Study

Potato Processor Flume Wastewater Case Study Potato Flume Water Treatabiliy with Floccin™ is VERY HIGH! This is the wastewater sample that was received from a potato processing facility. The facility utilizes water in a flume to transport potatoes. The resulting flume water has high levels of suspended solids. The flume water from the facility was tested with the Floccin™ K and ...

Jun. 23, 2010

By Integrated Engineers Inc.

Electron-electron interaction effect and resistivity maximum in nanocrystalline and ordered superconducting γ-Mo2N

Nanocrystalline superconducting γ-Mo2N phase is prepared by a chemical route, which crystallises in cubic structure with the space group, Pm3m. The crystallite size is found to be 18 nm. It shows the superconducting to normal transition temperature at 3.8 K. The resistivity behaviour is investigated to understand the effects of disorder and non-stoichiometry. At lower temperature, it shows ...

Aug. 18, 2010

By Inderscience Publishers

Effects of operational parameters on decolorisation of C.I. Reactive Black 5 in UV/TiO2 system

This study utilises a UV/TiO2 system to decolorise C.I. Reactive Black 5 (RB5). The effects of TiO2 dosage, pH, RB5 concentration and light power on the decolorisation efficiency using the UV/TiO2 system were determined. IO4− was employed as an oxidant to increase the photodegradation efficiency of UV/TiO2. The decolorisation rate constants (k) of RB5 in the UV/TiO2 system are consistent with ...

Mar. 1, 2011

By IWA Publishing