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…
Tag: water
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…
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…
What’s the difference between Phosphate tests for Orthophosphate, Total Phosphorous, Acid Hydrolyzable Phosphates and Organic Phosphates?
Phosphate tests are often stated as reporting Orthophosphate or Total Phosphorous, but can also give other parameters like Acid Hydrolyzable…
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…
How can I measure the Langlier Saturation Index (LSI) of water samples?
The Langlier (or Langelier) Saturation Index, LSI, of water indicates whether hard water will precipitate Calcium Carbonate deposits, dissolve Calcium…
Which Hach benchtop turbidity meter should I choose? What’s the difference between TU5 and TL23 Turbidity meters?
Q: I am looking for a new benchtop turbidity meter, but Hach offer two versions – the TL23 series and…
The SD 310 Oxi for simple, fast Dissolved Oxygen measurements
The portable meter SD 310 Oxi from Lovibond / Tintometer meets the day to day demands for sturdy and reliable…
Measuring pool water turbidity or cloudiness – why is my pool water cloudy?
Swimming pool water can sometimes appear cloudy. This is known as turbidity, and can be monitored and measured with a…
How can I measure Total Organic Carbon?
Total organic carbon (TOC) is the amount of carbon found in an organic compound and is an important sum parameter…
What is the pH of distilled water?
Purified water from distillation, deionisation or reverse osmomsis purification systems will usually have an acidic pH. But why is the…
How much water do I need to add to my COD vials?
A chemical oxygen demand (COD) test is used to measure the amount of organic compounds in a water sample. It…