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Milk density testing & UKAS?


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#1 poppysnoss

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Posted 18 February 2009 - 10:01 PM

Evening, all.

Do any of you currently carry out this method? Also, if I go for accreditation I should also carry out proficiency testing for milk density. I am having trouble finding a provider of EQA samples for this very purpose.

Am I being blind or is there something actually out there??? :helpplease:

Many thanks in advance!

Poppysnoss


Edited by poppysnoss, 15 September 2010 - 04:27 PM.


#2 Simon

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Posted 19 February 2009 - 12:58 PM

There are members from the dairy industry so fingers crossed you'll get some help soon. :smile:


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#3 cazyncymru

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Posted 19 February 2009 - 10:11 PM

Evening, all.

One of my dairy customers wants me to look into introducing a method for density testing of liquid milk and they go for UKAS accreditation.

Do any of you currently carry out this method? Also, if I go for accreditation I should also carry out proficiency testing for milk density. I am having trouble finding a provider of EQA samples for this very purpose.

Am I being blind or is there something actually out there??? :helpplease:

Many thanks in advance!

Poppysnoss



Hello

yes you can do densities. it is a BS method (BS 734)

I've added the method here for you.

you can buy proficiency samples from LGC. they are expensive though. i'd just do a round robin test myself.

Caz x

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#4 Charles.C

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Posted 20 February 2009 - 07:28 AM

Dear All,

Sorry Cazx, couldn’t resist a little thread hijacking –

i'd just do a round robin test myself

.

Are all robins really round ?? The truth remains unknown. :smile:

The modern use of the term dates from the 17th Century French ruban rond (round ribbon) [1][2]. This described the practice of signatories to petitions against authority (usually Government officials petitioning the Crown) appending their names on a document in a non-hierarchical circle or ribbon pattern (and so disguising the order in which they have signed) in order that none may be identified as a ringleader.
This practice was adopted by sailors petitioning officers in the Royal Navy (first recorded 1731)[2] .
The term round-robin is recorded in English much earlier, although not with the above meaning. It first appears in 1546 (i.e. someone who is round, and called Robin) and appears later applied to a category of person (precise meaning unknown): "These Wat Tylers and Round-Robins being driven or persuaded out of Whitehall" (1671)[2]

http://en.wikipedia....iki/Round-robin

More appropriately - http://en.wikipedia....ound_robin_test

Rgds / Charles.C

Kind Regards,

 

Charles.C


#5 poppysnoss

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Posted 22 February 2009 - 03:02 PM

Wow - thanks Caz, that's really useful. :thumbup:

I currently use LGC for prof testing but hadn't come across anything for density. Will have another look now...

Many thanks again!



#6 poppysnoss

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Posted 16 March 2009 - 01:18 PM

Hi All,

Back to this topic again. I bought a UKAS calibrated milk lactometer with a scale from 25 to 35 hydrometer degrees. However, I have been sent some slightly thicker samples (flavoured milks) which are off scale on my lactometer.
Can anyone tell me if there is a way of diluting samples for analysis of density and calculating back from there???

Many thanks in advance.



#7 cazyncymru

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Posted 27 April 2010 - 04:22 PM

Hi All,

Back to this topic again. I bought a UKAS calibrated milk lactometer with a scale from 25 to 35 hydrometer degrees. However, I have been sent some slightly thicker samples (flavoured milks) which are off scale on my lactometer.
Can anyone tell me if there is a way of diluting samples for analysis of density and calculating back from there???

Many thanks in advance.


You can buy hydrometers of different range scales

Try Scientific & Chemical
http://www.scichem.c...ers&catalogue=i

caz x

#8 Tony-C

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Posted 28 April 2010 - 01:53 AM

Hi All,

Back to this topic again. I bought a UKAS calibrated milk lactometer with a scale from 25 to 35 hydrometer degrees. However, I have been sent some slightly thicker samples (flavoured milks) which are off scale on my lactometer.
Can anyone tell me if there is a way of diluting samples for analysis of density and calculating back from there???

Many thanks in advance.


Hi Poppy

It may be easier to do this using a volumetric flask:

Density = Mass/Volume

Also note some density methods measure the density at 20C which is not entirely the same as filling temperatures and so is slightly out if you are using weight checks for volume control.

Regards,

Tony

#9 poppysnoss

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Posted 28 April 2010 - 02:58 PM

My goodness, this is an old thread.

The issue eventually resolved itself. In the end, it was only the liquid milk that required the milk density testing carried out, so I didn't need to buy an alternative hydrometer.

Caz - that link you added is where I bought my first one, so cheers for that.

Pops :biggrin:






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