Aquatopia Posted April 23, 2009 Report Share Posted April 23, 2009 Hi Christchurch water has a total hardness (as CaCO3) of 45mg/litre. Am I right in the following conversion ? 45mg/L (= 0.045/1000) thus =0.45/10,000 =4.5/100,000 =45/1,000,000 =45ppm Im basing this on a formula I found online that says 1mg/L = 1ppm and have translated it into decimals so that anyone else can see the mathematical progression as well as just applying a formula. Quote Link to comment Share on other sites More sharing options...
alanmin4304 Posted April 23, 2009 Report Share Posted April 23, 2009 Mg/litre is parts per million as there are one million mg/litre. Hardness is expressed as calcium carbonate even though it may be there as calcium chloride or a magnesium salt Quote Link to comment Share on other sites More sharing options...
Aquatopia Posted April 23, 2009 Author Report Share Posted April 23, 2009 Mg/litre is parts per million as there are one million mg/litre. Hardness is expressed as calcium carbonate even though it may be there as calcium chloride or a magnesium salt So what i said is right then Thats all I need to know - so it looks like chch water is pretty soft huh. Quote Link to comment Share on other sites More sharing options...
Ira Posted April 23, 2009 Report Share Posted April 23, 2009 Mg/litre is parts per million as there are one million mg/litre. Not to be too pedantic, but that's only correct if whatever it is weighs one kilogram per liter, which for example is only accurate for water at a 4 degrees C (It's less dense above and below) You cannot directly convert from mg/liter to parts per million that simply without knowing the atomic weights of what you're measuring and doing some math. But mg/L=ppm is usually not going to throw your measurements off any more than the hobby grade equipment and test kits do. Quote Link to comment Share on other sites More sharing options...
phoenix44 Posted April 23, 2009 Report Share Posted April 23, 2009 You cannot directly convert from mg/liter to parts per million that simply without knowing the atomic weights of what you're measuring and doing some math. But mg/L=ppm is usually not going to throw your measurements off any more than the hobby grade equipment and test kits do. gah! you beat me to it ha ha lol :lol: the errors are so small that it wont make a difference to what you need the calculations for Quote Link to comment Share on other sites More sharing options...
Aquatopia Posted April 23, 2009 Author Report Share Posted April 23, 2009 Thanks guys - as long as I am on the right track then I'm happy. Of course if CHCH water came out at pH8.2, with a general and carbonate hardness to match lake malawi i'd be a happy bunny. Quote Link to comment Share on other sites More sharing options...
alanmin4304 Posted April 23, 2009 Report Share Posted April 23, 2009 Agreed. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.