New ranges of Quantiofix peroxide test strips

Peracetic acid is a popular disinfectant. It is used for example by beverage manufacturers for cleaning bottles and containers and in dialysis centers to clean machines.

Quantofix Peroxide

After disinfection, careful rinsing is necessary. Quantofix Peracetic acid test strips allows the quick and easy check of rinse water.

These simple to use test strips have always been available in 0-25, 0-100 and 0-1000mg/l Machery Nagel have now added 0-50, 0-500 and 0-2000mg/l to this range. All Quantofix are available from Camlab in the UK with our usual quick turnaround and expert technical advice.

See the link for Quantofix ordering information, up to date prices and stock availability from Camlab.

The product has also been recently inproved, previously the peroxide test had to be kept cool in a refridgerator, all current versions can be stored at room temperature with a shelf life of  2.5 years.

Can I still get LDO probes for the Hach HQ10 and HQ20 meters?

Can I still get replacement LDO probes for the Hach HQ10 and HQ20 meters?

Hach LDO probe for HQ10 and HQ20

Yes, The Hach LDO probes and the Hach LDO Sensor caps are still available for the old HQ10 and HQ20 meters Please see the links for information and current pricing.

The HQ10 and 20 have been replaced by the HQ30 and HQ40 meters which are available from Camlab. Please note that the sensor caps and the probes are not intechangeable with the new meters.

Software Update Camlab Micro Osmometer MOD200PLUS

Micro Osmometer MOD200PLUS

Following extensive customer feedback the software on the Osmometer MOD200PLUS and Cryometer type 20 is being updated.

When the instrument is switched off using the mains switch the user will be asked if he wants to clean the needle
hole or switch off. The User has to press corresponding buttons, Cleaning will be the same as cleaning selected from the Menu. After this instrument is switched off. If user chooses switch off the needle hole will be thawed
and instrument is switched off like in the past.
If no button is pressed instrument waits for 1 hour and switches off automatically.
This change will be valid from instruments delivered since Jan 2010

What concentration of methanoic acid do I need to clean a Stuart Merit W4000 water still

What concentration of methanoic acid do I need to clean a Stuart Merit W4000 water still?

Stuart Merit Water Still

The information on cleaning is on page 5 of the user manual  . It recommends using 1l of 10% formic (methanoic acid) acid to clean the Merit Water still

How do I counter heavy metal interference in the Quantofix Iron Test?

We have been using Quantofix Iron indicator papers Ref MN/913.02.  By running spiked samples the results have been lower than expected due to discolouration of the indicatior sticks probably caused by the prssence of heavy metals. The instructions state that this can be eliminated by the addition of cadmium powder. Please could you advice on what source of cadmium powder is required as the instruction does not detail specifics i.e grade and quality.

Any laboratory grade cadmium powder will work for this interference

New Sample coolers from Techne

Two new innovative sample-cooling products from Techne available from Camlab.: the N° ICE is an electronic ice bucket containing ceramic-coated beads and the BL°CKICE cools tubes held in two Dri-Block^® inserts. Both the N° ICE and BL°CKICE are ideal for incubating samples for short or long periods at temperatures down to 0°C – no more tubes floating in boxes of melting wet ice!

Sample cooling from techne with the NoICE

Innovative bead technology enables the N° ICE to maintain any set temperature in the range 0 to 40°C, for example to keep reagents at 4°C throughout the working day. The small autoclavable and chemically resistant beads give the N° ICE  the versatility to support sample or reagent vessels of any shape. Cooling time can be saved by keeping the bucket of beads in a fridge overnight and simply inserting it into the N° ICE  when needed.

Sample cooling from Techne available from camlab

The BL°CKICE , Techne’s first cooling block, offers the same 0 to 40°C range as the N° ICE, but with more accurate temperature control and additional timer and alarm features. This product holds different sized tubes in two standard aluminium block inserts from the Dri-Block range. Fast cool-down times ensure the unit is quickly availably for use. An integrated timer allows up to 9 days to be programmed, with a buzzer sounding when the set temperature is reached and at the end of the elapsed time.
The BL°CKICE also accommodates the N° ICE bucket of beads, if required.

The novel N° ICE and BL°CKICE will prove ideal sample-cooling solutions in life science and molecular biology laboratories, providing accurate, stable sub-ambient temperatures for a wide range of applications. Both products can display temperature to one decimal place in either degrees Centigrade or Fahrenheit.

I have the error message EEE on my Hach DR2000 Spectrophotometer?

I have the error message EEE on my Hach DR2000 Spectrophotometer?

How do I clear it?
 
A: This error occurs due to taking three readings in a row with the lid open.

 To clear this follow these instructions:

Press Shift, then Configuration, then scroll through the menu (using the up arrow), until you see “reset warnings”, press the Enter key, it should now read “completed”, press the Method key, it should now return to the original programme.

The DR2000 is the old workhorse of the Hach Lange range this simple spectrophotometer is still utilised by a number of companies for their analysis of COD (Chemical Oxygen Demand). It has now been replaced by the DR2800 spectrophotometer for information on this new product click the link, for replacement reagents, spares or Service on your DR2000 just contact Camlab on 01954 233130

COD or Chemical Oxygen Demand definition

A number of customers have asked us for a definition of COD or Chemical Oxygen Demand which is detailed below:

Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as ammonia and nitrite. COD measurements are commonly made on samples of waste waters or of natural waters contaminated by domestic or industrial wastes. Chemical oxygen demand is measured as a standardized laboratory assay in which a closed water sample is incubated with a strong chemical oxidant under specific conditions of temperature and for a particular period of time. A commonly used oxidant in COD assays is potassium dichromate (K₂Cr₂O₇) which is used in combination with boiling sulfuric acid (H₂SO₄). Because this chemical oxidant is not specific to oxygen-consuming chemicals that are organic or inorganic, both of these sources of oxygen demand are measured in a COD assay.

Chemical oxygen demand is related to biochemical oxygen demand (BOD), another standard test for assaying the oxygen-demanding strength of waste waters. However, biochemicaloxygen demand only measures the amount of oxygen consumed by microbial oxidation and is most relevant to waters rich in organic matter. It is important to understand that COD and BOD do not necessarily measure the same types of oxygen consumption. For example, COD does not measure the oxygen-consuming potential associated with certain dissolved organic compounds such as acetate. However, acetate can be metabolized by microorganisms and would therefore be detected in an assay of BOD. In contrast, the oxygen-consuming potential of cellulose is not measured during a short-term BOD assay, but it is measured during a COD test.

You can find more about Camlab, Hach and Hanna COD – Chemical Oxygen Demand test vials and colrimters here. They maks measurement simple and do the calculations for you.

You can read more about the definition of COD here–> COD

pH test strips B Braun

We have been contacted by a number of end users about some pH test strips supplied by B Braun Medical. They have recently stopped supplying these and there has been some cionfusion over which strips are the correct ones.

The strips supplied to B Braun were Whatman part code WN/2638-500 click on the link to buy.

Unfortunately we cannot provide free samples.

Does the Hach Total Iron test detect rust?

When analysing water samples for Iron content there are a large number of forms the iron can take, from conventional dissolved Iron Salts such as Iron Chloride  to particles of Rust and Magnetite.

Does the Hach Iron test kit pick up all of this Iron or just the soluble Iron content?

Used in the standard mode the insoluble Iron particles will not be detected,. However there is an additional digestion step which can be performed to measure all of the iron in the sample.