Articles by Sophie Bryant

Articles by Sophie Bryant

Borosilicate glass
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Borosilicate glass vs Soda Lime glass vs Pyrex - what is the difference?

Q: Lots of lab glassware states the type of glass it is made of - Pyrex, Borosilicate Glass or Soda Lime. What is the difference between these types of glass? [caption id="attachment_8821" align="aligncenter" width="430"] Lab glassware can be soda lime, borosilicate or Pyrex glass - what is the differences between these types?[/caption] A: Different types of glass have different chemical...
Turbidity meters
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How do turbidity meters work? What does ratio and non ratio mean in a turbidity meter?

Turbidity meters are used to quickly measure the turbidity (or cloudiness) of water, caused by suspended solid particles. Understanding how turbidity meters work can help in achieving more accurate results and ensuring the samples and meter are handled correctly. [caption id="attachment_8711" align="aligncenter" width="443"] Turbidity standards, used in calibrating turbidity meters[/capti...
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...
PhotoLab 7600 spec by WTW
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Where can the WTW reagent free COD method be used? How does reagent free COD compare to standard methods?

WTW has developed an innovative reagent free system to measure COD, Nitrate and Nitrite without the need for vials. The OptRF system is built in to some of their spectrophotometers, and provides calculation of the results based only on absorbances in the UV wavelength range. However, this system is only applicable to some samples and should be evaluated before changing from traditional CO...
pH electrode
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What is sodium error or Na error in a pH electrode?

Q: I am looking to buy a pH electrode, many of them say "Na error over..." - what does this mean? A: Sodium error is also known as alkaline error, and is a phenomenon that occurs at very high pH levels - usually pH 12 or over. At very basic or alkaline pH levels, where Hydrogen ion concentration is relatively low compared to the Sodium ion concentration in the sample, you can see a Sodium...
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...
W4000 Bibby Merit Water Still
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How to install the W4000 Bibby Merit Water Still

The W4000 Bibby Merit Water Still is a great option for labs needing small quantities of distilled water. The still connects to a basic mains water supply and allows you to generate 4L per hour of distilled water compliant with European Pharmacopoeia and ASTM Type 4 [caption id="attachment_11833" align="alignleft" width="300"] A fully assembled W4000 Water Still[/caption] The still arr...
Suspended solids tests
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Which filter should I use for suspended solids tests?

Suspended solids tests are conducted as a water purity indicator, and to form part of discharge consent. The gravimetric method of suspended solids testing requires filter papers to be used, but these must be of the correct grade to ensure correct results. We've taken a look at which filter paper grades are approved for suspended solids tests.   Which filter paper should I u...
Burkle Pumps
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How to connect the anti static set for Burkle pumps

The anti-static set for Burkle pumps is essential when decanting flammable liquids. Without a properly earthed system static charge can build up, which can result in fire or even explosion. Connect the Burkle anti static set correctly following the instructions below [caption id="attachment_10283" align="aligncenter" width="419"] The Burkle Anti-static Set for use with their liquid pumps[...
thread adapters
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How to work out the thread size on a bottle, barrel or container

If you are looking for a pump to dispense liquid from a bottle or barrel, you may need to know the thread size of the container neck. Sometimes this will be written on the inside of the cap, or given in the specifications of the product. However if the thread size is unknown is it simple to work out by measuring it yourself, as explained below. [caption id="attachment_11593" align="aligncent...
2100Q Turbidity Meter
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Why is silicone oil important in turbidity meter measurements?

Q: Our turbidity meter comes supplied with a bottle of silicone oil. What is this for? Why is it important in the test? [caption id="attachment_11631" align="aligncenter" width="163"] Silicone oil is often supplied with turbidity meters, but what is it used for, and why is it important to the test?[/caption] A: The silicone oil is used to ensure the glass vial used in the turbidity me...
Double Walled Jacketed Duran Bottles
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Double walled jacketed Duran bottles for temperature control

The Duran Group has extended their range of wide mouth laboratory bottles by introducing two new double walled or jacketed bottles for temperature control of samples and experiments. [caption id="attachment_11619" align="aligncenter" width="253"] The new double walled GLS 80 bottles by The Duran Group[/caption] These GLS 80 bottles incorporate a jacket which can be used to circulated ...
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