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  #1  
Old 06-04-2007, 07:56 PM
carmey
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Default converting from dry wt. to wet wt.

I have some mussels that I dried, then digested and analysed for heavy metals, my results are in ug/g dry wt., I want to compare my results with others who have recorded their data in ug/g wet wt.

How do I convert my data???

If for example sample A has 8522ug/g dry wt. of Zn
and wet wt - 5.9g
Dry wt - 1.51g
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  #2  
Old 06-05-2007, 11:12 PM
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Default Re: converting from dry wt. to wet wt.

5.9 / 1.51 = 3.9

So it appears to me that the wet weight is 3.9 times more than the dry weight.

But the amount of heavy metals wont change between wet and dry, so:

8522 ug/g dry / 3.9 = 2185 ug/g wet

That would be just a guess on my part though, as I am not completly sure I understood what you were looking for.
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Old 06-06-2007, 02:52 PM
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Default Re: converting from dry wt. to wet wt.

I didn't answer this because I was confused too. To my knowledge, Zn is not, and has never been considered a heavy metal. Heavy metals are lead, gold, uranium, etc. I don'y know that Cd is even considered heavy.
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Old 06-12-2007, 05:19 PM
carmey
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Default Re: converting from dry wt. to wet wt.

Thanks for the reply, I'm not really sure what I'm talking about either, but what you said makes sense.

Sorry for using Zn in the example - pretend its Pb!
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  #5  
Old 10-20-2010, 08:29 AM
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Default Re: converting from dry wt. to wet wt.

You need to determine the moisture content of the raw (ie. wet weight) material before you can convert from dwb to wwb.
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  #6  
Old 12-10-2010, 11:23 AM
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Default Re: converting from dry wt. to wet wt.

I am also facing the same problem, Please help me. I want to convert the dry wet concentration of element to wet weight.
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  #7  
Old 02-21-2011, 04:42 AM
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Default Re: converting from dry wt. to wet wt.

Quote:
Originally Posted by Robert Fogt View Post
5.9 / 1.51 = 3.9

So it appears to me that the wet weight is 3.9 times more than the dry weight.

But the amount of heavy metals wont change between wet and dry, so:

8522 ug/g dry / 3.9 = 2185 ug/g wet

That would be just a guess on my part though, as I am not completly sure I understood what you were looking for.
Hello
I think first you should find water content of muscle (or % water). for example If we have 80% water in a meat. it means that in 1 kg of meat we have 800 gr water + 200 gr solid matters. So if you have 0.4 ug/kg dry wet (Hg concentration) it means that you have 0.4 ug metal in 5 kg wet wight of meat (1 kg of solid or dry matter have 4 kg water because water content is 80%). so you should divide 0.4 ug to 5 for calculation amount of have metal consecration in 1 kg wet weight. 0.4 ug/ 5 kg = 0.08 ug/kg wet weight.

it is my idea, please ask from other researcher.
my ID: Esmaildarya@gmail.com
Esmail
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  #8  
Old 02-22-2012, 11:09 AM
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Default Re: converting from dry wt. to wet wt.

You must know the moisture content of your sample for conversion. The formula for conversion is: Dry weight concentration (DW) = wet weight concentration(WW) x (100/100-moisture percentage). To go from dry weight to wet weight -- WW = DW x ((100-%moisture)/100)
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  #9  
Old 04-17-2013, 02:28 PM
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Default Re: converting from dry wt. to wet wt.

All you need is the moisture content (MC) and the concentration (i.e., 10g N/100g Dry Material) of your material. You can calculate MC using the fresh (Mfresh) and dry mass (Mdry) by using:

[(Mfresh - Mdry) / (Mfresh)] = MC

Then to get a concentration fresh weight you multiply your concentration by the moisture factor (MF):

(1 - MC) = MF

for example if we have a leaf that is 10gN/100g Dry Weight, with a moisture content of .75 we would take:

10gN/100g Dry Weight * (1 - .75) = 2.5gN/100 g Fresh Weight
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  #10  
Old 04-17-2013, 02:40 PM
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Default Re: converting from dry wt. to wet wt.

You need moisture content (MC):

MC = [ (wet wt. - dry wt.) / (wet wt.) ]

and then your moisture factor (MF):

MF = (1 - MC)

you can then take your concentration and multiply it by your MF, i.e., your example numbers:

(MF) * concentration = [ 1 - MC ] * concentration =

{ 1 - [ (5.9g-1.51g)/(5.9g) ] } * 8522ugZn/gDryWeight = (1 - .744) * 8522ugZn/gDryWeight = 2181.63ugZn/gFreshWeight
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