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**To**:**Aquatic-Plants at actwin_com****Subject**:**Re: Measures****From**:**Greg Morin <greg at seachem_com>**- Date: Fri, 2 Feb 2001 10:49:04 -0500
- In-Reply-To: <200102020848.DAA06010 at actwin_com>
- References: <200102020848.DAA06010 at actwin_com>

>Ok so call me a little slow BUT........what the !$@! >is meq/l ???????????? this has been used extensivly in >the thread: "Equilibrium, Ca and Mg levels" is this >suposed to be mg/l ?????? Brief background: 1 equivalent in chemical terms means you have 6.02 x 10^23 molecules or atoms of that particular chemical compound. But that's a pretty big number, so think of like this: 1 dozen is twelve items. If I have 1 dozen chicken eggs and 1 dozen ostrich eggs, then which item do I have more of? In chemical terms I have the same quantity of both items; I have one dozen of each. You can also say I have 1 equivalent of each (the quantities are equivalent). If I answer in terms of mass, then I have more of ostrich egg. Plants don't care how much these elements weigh, they just need a certain quantity. So if you say you have 40 g of calcium and 24 g of magnesium you might think you have more calcium than magnesium, but you actually don't in terms of numerical equivalence because 1 equivalent of calciums has a mass of 40 grams and 1 equivalent of magnesium has a mass of 24 grams; therefore you have exactly the same amount of magnesium as calcium. And the "m" of meq/L means "milli", so that just means 1/1000 of an equivalent. It's just easier to say 1 meq/L than 0.001 eq/L. BTW, you can convert meq/L to mg/L by multiply the meq/L number by the molecular weight of the chemical in question. So 1 meq/L of calcium is the same as 40 mg/L of calcium. -Greg Morin -- Gregory Morin, Ph.D. ~~~~~~~Research Director~~~~~~~~~~~~~~ Seachem Laboratories, Inc. www.seachem.com 888-SEACHEM ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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