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#1
12-13-2008, 10:45 AM
 hilalfarooq2 Junior Member Join Date: Dec 2008 Posts: 2 Rep Power: 0
Conversion of Fe2O3 into Fe (ppm/ppb)

I have 4.4% of Fe2O3 (as measured by XRF) can anybody help me to convert it into Fe in ppm or ppb.

Thanks
Regards
Farooq
#2
12-13-2008, 11:12 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,410 Rep Power: 12
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Quote:
 Originally Posted by hilalfarooq2 I have 4.4% of Fe2O3 (as measured by XRF) can anybody help me to convert it into Fe in ppm or ppb. Thanks Regards Farooq
Hi, what is your Fe2O3 in, is it soil, or is it made up in a solution?
#3
12-13-2008, 10:21 PM
 elena13 Guest Posts: n/a
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

molecular weight Fe2O3=159.69g
molecular weight Fe=55.845g
4.4%=44000 ppm
159.69----------55.845*2 g Fe
44000-----------x

x=44000*55.845*2/159.69
x=30774.38 ppm Fe
#4
12-13-2008, 11:27 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,410 Rep Power: 12
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Hi Elena, sometimes questions like this have been asked before, but it has turned out that the questioner has a lab result from a sample that has been dissolved up, and run against a set of standards. This is why we can always do with a bit more info.
#5
12-14-2008, 12:00 AM
 hilalfarooq2 Junior Member Join Date: Dec 2008 Posts: 2 Rep Power: 0
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Quote:
 Originally Posted by Mrs X Hi, what is your Fe2O3 in, is it soil, or is it made up in a solution?
This is in the soil sample and measured by non-distructive method.
#6
12-14-2008, 09:42 AM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,410 Rep Power: 12
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Quote:
 Originally Posted by hilalfarooq2 This is in the soil sample and measured by non-distructive method.
In post #3, Elena gave the correct method.
#7
05-09-2010, 11:33 PM
 Danny of guild Guest Posts: n/a
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Hi Gents,

To convert Fe2O3 to Fe divide by 1.4298.

To convert % to PPM multiply by 10000.

It is that simple.

He is obviously analysing iron ore by XRF fusion or PP.
#8
04-01-2011, 08:47 AM
 Unregistered Guest Posts: n/a
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Quote:
 Originally Posted by Danny of guild Hi Gents, To convert Fe2O3 to Fe divide by 1.4298. To convert % to PPM multiply by 10000. It is that simple. He is obviously analysing iron ore by XRF fusion or PP.
Hi...would you please late me know how you work out To convert Fe2O3 to Fe divide by 1.4298.
I mean how you work out to get 1.4298

Thanks
#9
04-01-2011, 08:50 AM
 Unregistered Guest Posts: n/a
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Quote:
 Originally Posted by Danny of guild Hi Gents, To convert Fe2O3 to Fe divide by 1.4298. To convert % to PPM multiply by 10000. It is that simple. He is obviously analysing iron ore by XRF fusion or PP.
Hi...would you please late me know how you work out To convert Fe2O3 to Fe divide by 1.4298.
I mean how you work out to get 1.4298
can you email it to aj4u2000@hotmail.com ...I don't know how to get the answer back from this site.
Thanks
#10
04-01-2011, 02:09 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,410 Rep Power: 12
Re: Conversion of Fe2O3 into Fe (ppm/ppb)

Quote:
 Originally Posted by Unregistered Hi...would you please late me know how you work out To convert Fe2O3 to Fe divide by 1.4298. I mean how you work out to get 1.4298 Thanks
It is worked out from the atomic weights of the elements, and calculated as a proportion:

Atomic weight Fe = 55.847g/mol, atomic weight oxygen = 15.999g/mol

2 x 55.847 + 3 x 15.999 = 159.691grams per mole (g/mol)

The iron proportion is (2 x 55.847)/159.691 = 0.6994. The reciprocal is 1.430, so you can either divide by 1.430 or multiply by 0.6994 to get the weight of iron in iron oxide.

Note however, iron oxide is rarely pure Fe2O3, there are usually other oxide species and hydroxides present.

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