Posts tagged 'filtration'

Syringe filters - which one do I need?
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Syringe filters - which one do I need?

Syringe filters are used to help filter samples containing solid particles, into sample tubes for analysis. These work by using a membrane with a particular pore size to catch any solids within the samples. The Camlab choice coloured filters are available with two different pore sizes, and in three different membrane sizes. Some of these filters come with pre-filters to catch any large particl...
What syringe filter is the best for my application?
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What syringe filter is the best for my application?

There is a huge selection of syringe filters available in all kinds of material, pore sizes and diameters.  When it comes to selecting the most appropriate one for your application this can make it seem like a bit of a minefield. We break the process down into a number of steps to help simplify selection. 1. Match pore size with your application Most types of syringe filters come in a selec...
Vacuum Filtration
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Vacuum Filtration- How do I secure the funnel to the flask?

Vacuum filtration, sometimes known as Buchner filtration is used to isolate a solid product or impurity from a liquid filtrate. Any solid product or impurity can be left on the filter paper present within the funnel and easily removed, whilst the filtrate passes through the funnel into the flask at the bottom, to be used further or discarded. Whilst the set-up can be considered simple in itself...
Vacuum Filtration
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What is the difference between gravity and vacuum filtration?

There are two types of filtration which are commonly used in the laboratory and it is important to select the correct type for the work you are doing. But what is the difference between gravity and vacuum filtration? How do you choose what type of filtration you need to do? And what equipment do you need for each type? Vacuum Filtration - also known as Buchner filtration - for when you nee...
Filter Papers
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Am I using the right filter material and size for my filtration?

Selecting the right filter for your lab filtration will help to ensure you get the desired results. After considering whether you need vacuum or gravity filtration, you then need to select a suitable filter material and size. [caption id="attachment_9504" align="aligncenter" width="300"] With so many types and sizes of filter paper available, make sure you choose the right one for the tas...
Vacuum Filtration
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What equipment do I need to perform a vacuum filtration?

Filtration under vacuum, also known as Büchner filtration, is commonly used to isolate the solid precipitate from a solution. This technique is used in syntheses, for example when a reaction has yielded a solid, or in analyses including gravimetric analysis of suspended solids. Although performing the filtration is simple, several pieces of equipment are needed which must all fit together, so...
Filtering water samples
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Which filters are best to prepare samples for heavy metals analysis?

Filtering water samples before ICP-MS or HPLC analysis for heavy metals testing is good practice - to help protect these delicate instruments from damage caused by larger particles. However some filters can introduce interferences which may affect the results - so what type of filter is best for heavy metals analyses? Why filter samples? Samples taken in the field are often high in...
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Sintered disc or sintered frit filtration funnels - how to care for sintered discs? When to select a sintered disc funnel? What do sintered disc grades mean?

Vacuum filtrations using a Buchner flask and funnel with a vacuum pump are commonly used to isolate a solid of interest from a liquid. Most commonly a porcelain Buchner funnel with a filter paper placed on top is used, but in some instances a sintered disc funnel is more appropriate. But when would you select a sintered disc funnel? And how should a sintered disc filter funnel be cleaned ...
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How can I stop my syringe filters getting blocked up?

Syringe filtration is a great, quick method of filtering samples prior to further analysis by HPLC, UV-VIS analysis or other analytical techniques. Some samples which have a high amount of solid particulates in them can block up syringe filters, slowing down the process. GE Whatman have designed two specialist syringe filter ranges with a clever filter structure which aims to combat this,...
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How can I cut down HPLC sample preparation time?

The preparation of samples prior to HPLC or UHPLC analysis can be very time consuming, particularly in laboratories which analyse a high volume of samples. Filter manufacturers Whatman have developed a range of unique devices which can cut sample prep time by 1/3, and could even save money too - the UniPrep Vials [caption id="attachment_9638" align="aligncenter" width="300"] The UniPrep V...
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What size filter paper do I need for my funnel?

How do you choose the right size filter paper for your funnel? Use the table below to see what size filter paper you should use Gravity filtration using a filter paper inside a filtration funnel is used to remove precipitates from a liquid. The remaining liquid is known as the filtrate. For standard shaped filter funnels where the walls are at 58 or 60° the table below shows the r...

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Filtration and filter paper types - what's the difference between filters?

When looking for filters there are a lot of different options available to suit different applications. It is important to ensure you choose the best type for your work, but what do the different terms mean? Paper or Cellulose Filters - these are manufactured from cellulose fibres and are used for general filtration. The particle retention level can go down to 2.5 µm. This type of filter pap...

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