headspace measurement Articles | Environmental XPRT

Patented method for oxygen permeation analysis of food packaging

The PermMate utilizes an innovative method of oxygen permeation analysis of finished packages - ‘Ambient Oxygen Ingress Rate’ (AOIR). Providing the ability to test the oxygen permeability of packages under different test conditions including how the product will be stored – at any temperature and humidity. The permeability and barrier qualities of film and foils change when it ...

May 16, 2011

By Industrial Physics Product Integrity Limited

Patented Fence Electrode Eliminates Humidity Effects on Ion Science PIDs

Introduction In the past, a major limitation to the use of PIDs was their susceptibility to ambient humidity. Humidity effects came in two forms: 1) a decrease in response to VOCs due to a quenching effect as humidity increased (false negative) and 2) a sharp rise and drifting response when subject to very high humidities of typically >90% RH (false positive). The latter response was avoided ...

Aug. 11, 2015

By Ion Science Ltd.

Headspace gas analysis video

Why does headspace gas need to be measured? To check the continuity and quality of the gas supply to the packing machine, the efficiency of the flush/vacuum cycle and the integrity of the pack seal. To optimise gas usage and save costs. To meet customer headspace gas quality standards. To present quality data to auditors, food quality inspectors or as part of a quality process e.g. ...

Oct. 22, 2015

By Industrial Physics Product Integrity Limited

A sewer ventilation model applying conservation of momentum

The work presented herein was completed in an effort to characterize the forces influencing ventilation in gravity sewers and to develop a mathematical model, based on conservation of momentum, capable of accounting for friction at the headspace/pipe interface, drag at the air/water interface, and buoyancy caused by air density differences between a sewer headspace and ambient. Experiments were ...

Jan. 1, 2011

By IWA Publishing

Sewer Siphon Assessment and Air Jumper Design

ABSTRACTIn response to customer complaints about sewer odor, Orange County Sanitation District (OCSD), California launched a project to investigate the ventilation requirements of existing sewer siphons, to verify adequacy of existing air jumper operation, and determine the need for new air jumpers or additional air jumper capacity. The challenge was assessing sewer siphon air jumper adequacy ...

Oct. 22, 2006

By Water Environment Federation (WEF)

Differential Stimulation of Haloreduction by Carbon Addition to Subsurface Soils (PDF)

Highly substituted ethenes such as PCE and TCE are susceptible to microbial reductive dehalogenation and halorespiration under anaerobic conditions. The objective of this study was to evaluate whether soil from a bulk aerobic aquifer, historically contaminated with chlorinated ethenes (CEs), could be made anaerobic by carbon source addition to enhance haloreduction, and to evaluate how the ...

Jan. 1, 2001

By Regenesis

Effects of antibrowning solution and chitosan–based edible coating on the quality of fresh–cut apple

Fresh–cut apples were treated with an antibrowning solution and with a chitosan–based edible coating associated to antibrowning agents and the effects on the deterioration at low temperature were studied. The combined effect of ascorbic acid (AA), citric acid (CA) and chitosan was also evaluated. Control, coated and uncoated apples were packed in polyethylene terephthalate trays and the changes ...

Aug. 13, 2013

By Inderscience Publishers

Evaluating the potential of an electronic nose for detecting the onset of anaerobic conditions during composting

Most bad odours in composting plants are formed under anaerobic conditions and often they could be avoided if detected early enough. In this project an electronic nose was used to evaluate the odours produced during a composting process at bench scale. The electronic nose consists of an array of electronic chemical sensors with partial specificity and an appropriate pattern recognition system ...

Jan. 2, 2002

By ORBIT e.V.

Odour reduction strategies for biosolids produced from a Western Australian wastewater treatment plant: results from Phase I laboratory trials

This study investigated sources of odours from biosolids produced from a Western Australian wastewater treatment plant and examined possible strategies for odour reduction, specifically chemical additions and reduction of centrifuge speed on a laboratory scale. To identify the odorous compounds and assess the effectiveness of the odour reduction measures trialled in this study, headspace ...

Dec. 19, 2013

By IWA Publishing

A Chemical Dynamics Model for CAH Remediation with Polylactate Esters.

ABSTRACT: The polylactate esters of sorbitol, xylitol and glycerol are a class of new chemical compounds that slowly release lactic acid into groundwater. The lactic acid is biotransformed into pyruvic acid and subsequently into acetic acid releasing hydrogen in both steps. The hydrogen is used by naturally occurring dechlorinating bacteria to reduce PCE to ethene by way of TCE, DCE and VC. A ...

Jan. 1, 2001

By Regenesis

Detecting Mercury in Water

Determination of Mercury (Hg) in Water by Hand-Held, Portable Cold Vapor Atomic Fluorescence SpectrometryWater is the most familiar and most abundant compound on Earth, making up 71% of its surface area.[1]It is a vital component for all known forms of life and is the aquatic habitat for thousands of species of microalgae, fish and shellfish. [2] With the presence of running water in our ...

Aug. 11, 2015

By AMETEK Brookfield

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