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### Topic: How do I convert μmol/L into μg/L ?  (Read 59005 times)

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#### kaahtivak

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##### How do I convert μmol/L into μg/L ?
« on: April 03, 2008, 10:30:13 AM »
Hi
I really need to knw how do to convert μmol/L  into μg/L ? I have looked everywhere can't find it. If possible give an example.
Thanks
Kav

#### Borek

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##### Re: How do I convert μmol/L into μg/L ?
« Reply #1 on: April 03, 2008, 11:20:11 AM »
You have to know your substance - you can't convert moles/mass without knowing molar mass. For general conversion ideas google dimensional analysis.
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#### kaahtivak

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##### Re: How do I convert μmol/L into μg/L ?
« Reply #2 on: April 03, 2008, 02:35:11 PM »
Yeah it is the measurement for silicon. Thak You

#### JGK

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##### Re: How do I convert μmol/L into μg/L ?
« Reply #3 on: April 03, 2008, 03:44:34 PM »
silicon has a molecular weight of 14

a 1 molar solution is 14 g of silicon in 1 litre which is a concentration of  (wt/Volume)
14 g/L = 0.014 g/mL

So 1 M = 0.014g/mL or 14 mg/mL
1 mM = 0.000014 g/mL = 0.014 mg/mL = 14 µg/mL
1 µM =0.00000014 g/mL = 0.000014 µg/mL = 0.014 µg/mL

therefore to convert µM to µg/mL multiply by 0.014

it ain't rocket science
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#### sjb

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##### Re: How do I convert μmol/L into μg/L ?
« Reply #4 on: April 06, 2008, 06:11:36 AM »
silicon has a molecular weight of 14

Wrong, but the calculation principle is right (at least, apart from the second µ in the last line).

See e.g. http://en.wikipedia.org/w/index.php?title=Silicon&oldid=203639537

#### JGK

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##### Re: How do I convert μmol/L into μg/L ?
« Reply #5 on: April 07, 2008, 08:10:27 AM »
silicon has a molecular weight of 28

a 1 molar solution is 28 g of silicon in 1 litre which is a concentration of  (wt/Volume)
14 g/L = 0.028 g/mL

So 1 M = 0.028 g/mL or 28 mg/mL
1 mM = 0.000028 g/mL = 0.028 mg/mL = 28 µg/mL
1 µM =0.00000028 g/mL = 0.000028 mg/mL = 0.028 µg/mL

therefore to convert µM to µg/mL multiply by 0.028

it ain't rocket science

Corrected, obviusly rocket science was beyond even me when I sent that one out
Experience is something you don't get until just after you need it.

#### Valdorod

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##### Re: How do I convert μmol/L into μg/L ?
« Reply #6 on: April 07, 2008, 12:46:46 PM »
Rocket Science

Conversions

MARS CLIMATE ORBITER

120 million dollars waisted because rocket scientists at NASA could not do conversions

Valdo

#### The Roseate Spoonbill

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##### Re: How do I convert μmol/L into μg/L ?
« Reply #7 on: April 13, 2008, 11:34:22 PM »
μmol/L*(x/μmol) = μg/L

x = the number of grams per micromole. Just check a decnet periodic table. and then multiply by a million.
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