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#1
12-06-2007, 08:00 AM
 ekgrem Guest Posts: n/a
mg/l to micromol concentration

I'm a geologist- working on some oceanic surface water concentrations, and having a bit of difficulty converting from mg/l to micromols.

I have the average abundaces of Fe, Si, N, and P in seawater in mg/l but would like to convert to micromol to compare them with other values I have.

Here are the numbers:
Nitrogen: 11.5 mg/l (as N2, NO3, and NH4)(total amt in the ocean in tonnes: 1.50E13)

Silicon: 2 mg/l (as Si(OH)4) (total amt:2.64E12)

Phosphorus: 6E-2 mg/l (as HPO4, PO4, H2PO4) (total amt: 7.93E10)

Fe: 2.2E-5 mg/l (as Fe(OH)2, Fe(OH)4) (total amt: 2.9E7)

Thank so much for your help!
#2
12-06-2007, 10:47 AM
 Unregistered Guest Posts: n/a
Re: mg/l to micromol concentration

Quote:
 Originally Posted by ekgrem I'm a geologist- working on some oceanic surface water concentrations, and having a bit of difficulty converting from mg/l to micromols. I have the average abundaces of Fe, Si, N, and P in seawater in mg/l but would like to convert to micromol to compare them with other values I have. Here are the numbers: Nitrogen: 11.5 mg/l (as N2, NO3, and NH4)(total amt in the ocean in tonnes: 1.50E13) Silicon: 2 mg/l (as Si(OH)4) (total amt:2.64E12) Phosphorus: 6E-2 mg/l (as HPO4, PO4, H2PO4) (total amt: 7.93E10) Fe: 2.2E-5 mg/l (as Fe(OH)2, Fe(OH)4) (total amt: 2.9E7) Thank so much for your help!
Consult periodic table to look up atomic weight of each element, example nitrogen, 14.01 daltons. The molar mass is the number of grams numerically equal to the atomic or molecular weight (depending on what you are converting to moles). So nitrogen is 14.01 g/mol

11.5 mg/L x 1 mol/14.01 g = 0.821 mmol/L or 821 µmol/L. You may proceed thus for each element.
#3
12-06-2007, 01:11 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,413 Rep Power: 12
Re: mg/l to micromol concentration

Quote:
 Originally Posted by ekgrem I'm a geologist- working on some oceanic surface water concentrations, and having a bit of difficulty converting from mg/l to micromols. I have the average abundaces of Fe, Si, N, and P in seawater in mg/l but would like to convert to micromol to compare them with other values I have. Here are the numbers: Nitrogen: 11.5 mg/l (as N2, NO3, and NH4)(total amt in the ocean in tonnes: 1.50E13) Silicon: 2 mg/l (as Si(OH)4) (total amt:2.64E12) Phosphorus: 6E-2 mg/l (as HPO4, PO4, H2PO4) (total amt: 7.93E10) Fe: 2.2E-5 mg/l (as Fe(OH)2, Fe(OH)4) (total amt: 2.9E7) Thank so much for your help!
Hi,

If I do this for the nitrogen, will you be able to try for the rest yourself?

Molar mass of nitrogen is 14grams per mol, or 14mg per millimol, or 14micrograms per micromol.

11.5mg per liter of Nitrogen, gives 11500/14 = 821micomolar solution.

Hope this helps.
#4
01-05-2011, 10:26 PM
 Unregistered Guest Posts: n/a
Re: mg/l to micromol concentration

How much is 1 mg/l of gibberlic acid equal to in micro moles ? Molecular Weight of gibberlic acid: 346.38

#5
01-06-2011, 02:33 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,445 Rep Power: 19
Re: mg/l to micromol concentration

Quote:
 Originally Posted by Unregistered How much is 1 mg/l of gibberlic acid equal to in micro moles ? Molecular Weight of gibberlic acid: 346.38 Please help
1 mg/L x 1 mol/346.38 g = 2.9 µmol/L
#6
01-12-2011, 08:11 AM
 Unregistered Guest Posts: n/a

I'm a nutritionest- working on lab , and having a bit of difficulty converting from g/l to micromols.

I want to plate 10, 5, 2, 1, .5, .2, .1 micromoles of cadmium chloride in 250 microlitter wells of media
#7
10-17-2011, 06:26 AM
 yathish Guest Posts: n/a
conversion of milligram to micromoles

i have 200milligram of one product how to convert this product into micromoles can you pease guide me sir.......
#8
10-17-2011, 11:28 AM
 JohnS Moderator Join Date: Dec 2007 Location: SE Michigan, USA Posts: 9,445 Rep Power: 19
Re: conversion of milligram to micromoles

Quote:
 Originally Posted by yathish i have 200milligram of one product how to convert this product into micromoles can you pease guide me sir.......
You have to identify the substance and determine its molar mass to convert between grams and moles.
#9
08-03-2013, 01:02 AM
 Unregistered Guest Posts: n/a
Re: micromol to mg/L concentration

Hello Sir, Could you plz tell me what is the formula to convert 5.7 µmol to mg/L?? Thank you...

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