Particulate Gravimetry
Particulate Gravimetry - Related Videos
01:03
Precipitation Gravimetry
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2024
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture. In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
01:05
Gravimetry: Overview
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2024
Gravimetric analysis is a quantitative method where the analyte is isolated and weighed directly or after conversion into a substance of known composition. Gravimetric analysis can be classified as precipitation, electrogravimetry, volatilization, and particulate gravimetry, based on the method used to isolate the analyte. In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
00:49
Gravimetry: Inorganic And Organic Precipitating Agents
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2024
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
13:29
Production and Measurement of Organic Particulate Matter in a Flow Tube Reactor
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Cited by 5 •
2018
This paper describes the operation procedure for the flow tube reactor and related data collection. It shows the protocols for setting the experiments, recording data and generating the number-diameter distribution as well as the particle mass information, which gives useful information about chemical and physical properties of the organic aerosols.
08:48
Analysis of the Ambient Particulate Matter-induced Chromosomal Aberrations Using an In Vitro System
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Cited by 3 •
2016
This protocol describes techniques for the quantification and characterization of chromosomal aberrations in vitro in RAW264.7 mouse macrophages after treatment with ambient air particulate matter.
FAQs
The concentration is obtained by dividing the filter’s mass increase by the volume of gas or liquid that passed through it. The mass increase represents the particulate matter retained during sampling. Relating that mass to sampled volume converts a balance measurement into a concentration, allowing results from samples with different volumes to be compared meaningfully.
Sampled volume provides the scale needed to interpret the collected mass. The same mass increase could represent different concentrations if one sample contained a larger volume than another. Measuring the sample volume therefore connects the filter result to the original gas or liquid stream and supports consistent comparison among environmental, industrial, or laboratory samples.
Pre-weighing establishes the filter’s starting mass, so the later increase can be attributed to material retained during sampling. Controlled drying places the filter in a defined condition before the final weighing. Together, these steps make the difference between the two weighings a consistent basis for determining particulate loading.
The result indicates the total mass of suspended particulate matter collected from a measured portion of a gas or liquid. This aggregate measurement is useful when the overall particle burden is the main concern, such as evaluating air quality, exposure conditions, industrial process streams, or the performance of a filtration system.
A measurement begins with a pre-weighed filter and a measured sample volume. The sample passes through the filter, which retains suspended particles. The filter is then dried under controlled conditions and weighed again. Analysts use the difference between the initial and final masses, together with the sampled volume, to calculate concentration.
This approach is useful when researchers need a direct mass-based assessment of suspended particles. Applications identified for it include environmental monitoring, process control, exposure assessment, air-quality studies, industrial hygiene evaluations, combustion research, and filtration-performance assessment. Its value comes from connecting a collected particulate mass with a defined sampled volume.