Finding nitrite ppm

Air dried cured Meat Techniques

Finding nitrite ppm

Postby senorkevin » Thu May 29, 2014 3:17 pm

Is this the formula for finding nitrite ppm in dry cured bacon:

g nitrite x % cure mix x 1,000,000 =ppm
grams of meat
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Re: Finding nitrite ppm

Postby wheels » Thu May 29, 2014 5:46 pm

No, see p24 of the Inspectors' Handbook, it's:

lb nitrite × % cure mix applied × 1,000,000 = ppm
lb cure mix

NB The calcs also work for gm. In the calcs they express percentages in an unusual way, they would express 4% as 0.04.

HTH

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Re: Finding nitrite ppm

Postby senorkevin » Thu May 29, 2014 5:52 pm

That is the calc for grams? Cant I just change lb for grams?
Last edited by senorkevin on Thu May 29, 2014 6:07 pm, edited 1 time in total.
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Re: Finding nitrite ppm

Postby senorkevin » Thu May 29, 2014 5:59 pm

Thats why I'm trying to work out the ppm as part of my question in topic "Chemicals" in product use.
I want to show him the cure #1 @ .5% doesn't work
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Re: Finding nitrite ppm

Postby senorkevin » Thu May 29, 2014 6:09 pm

In that case what is the difference between cure mix applied and cure mix?
Isn't the formula on page 24 shown in the procedure table on page 25?
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Re: Finding nitrite ppm

Postby senorkevin » Thu May 29, 2014 7:14 pm

Or do I need to convert grams to pounds and use the formula that way?
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Re: Finding nitrite ppm

Postby wheels » Thu May 29, 2014 7:52 pm

No, the formula will work for either - use gms or lb - but don't mix the two!

Post the recipe and someone'll use it to explain.

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Re: Finding nitrite ppm

Postby NCPaul » Thu May 29, 2014 8:42 pm

It is going to be best to work with everything in grams since you will need to weigh the cure #1 in grams.
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Re: Finding nitrite ppm

Postby senorkevin » Thu May 29, 2014 9:00 pm

Ok here goes. Here is an example of the dry cure calculator:
Total Weight of Boneless Meat gm
156 ppm (neither)
Skin Off
What is the percentage of Nitrite in the Curing Salt? 7 %
Salt required in Meat: 2.5 %
Sugar required in Meat: 1.0%
The results are:
Salt: 22.93 gm
Sugar: 10 gm
The maximum amount of Nitrite curing salt permitted by the regulations is: 2.23 gm
Total Weight of Cure: 35.16 gm

From what I can figure out the salt is @ 2.5% (22.93+2.07 salt in cure = 2.5)
Therefore .16g of sodium nitrite.
Meat: 1000g
Salt:25g (71.10%)
Suger: 10g (24.44%)
Nitrite: .16g (0.46%)
Total: 35.16 (100%)
Using the formula in the handbook (but in grams not lbs):
(0.16)g nitrite * (0.04)g cure mix applied * 1,000,000 =182 ppm
(35.16) g cure mix

Is that correct? I used the 4/100 to get to 4 %
Now I'm thinking something is wrong with the 4%
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Re: Finding nitrite ppm

Postby wheels » Thu May 29, 2014 11:37 pm

The formula is:

1. Cure amount x % nitrite = 2.23 x 7% = 0.1561

2. % cure mix applied = 35.16/1000 = 0.03516

1. times by 2. times by 1,000,000 = 5488.476

Divided by the cure mix = 35.16

5488.476/35.16 = 156.1 PPM

QED

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Re: Finding nitrite ppm

Postby senorkevin » Thu May 29, 2014 11:44 pm

Thank you so much!
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Re: Finding nitrite ppm

Postby senorkevin » Fri May 30, 2014 12:47 am

Is the 1000 in part 2, the meat in grams?
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Re: Finding nitrite ppm

Postby senorkevin » Fri May 30, 2014 1:36 am

Sorry to keep dragging this out but how do I find the salt content at 2.5% when in the calc it is less?
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Re: Finding nitrite ppm

Postby senorkevin » Fri May 30, 2014 1:54 am

I have figured it out!
1) % of nitrite x cure amount = 0.07*2.23=n
2) n - % of salt = total salt needed

Im sure there is an easier way to do it.

This topic will self destruct in 5, 4, 3, 2, 1.....
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Re: Finding nitrite ppm

Postby wheels » Fri May 30, 2014 2:48 pm

In your case, the salt % will be the weight of 93% of the cure #1, plus the added salt, divided by the weight of the meat, and then multiplied by 100.

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