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#1
20-12-2003, 04:14 PM
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How many ml in a drop ?
Dear all,
Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe |
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#2
20-12-2003, 05:02 PM
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How many ml in a drop ?
I assume it depends on the hole size ... probably the best thing to do is to
see how many drops from your container fill a teaspoon, which is about 5 ml, and do the math. Or better yet, put those drops right into a container marked off in ml. Given that you're in Belgium (I think), you probably won't have a problem finding one. ;-) I've seen people use estimates of anywhere from 12 to 20 drops per ml. I use the latter, so that when (for example) I'm adding AmQuel to a US gallon of water, I use 10 drops. Recommended dosage for AmQuel is 5 ml per 10 US gallons. "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe |
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#3
20-12-2003, 06:38 PM
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How many ml in a drop ?
It's fairly variable--for aqueous solutions, it's around 20-100 ul/drop
which translates to 10-50 drops per ml. -coelacanth "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe |
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#4
21-12-2003, 01:30 PM
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How many ml in a drop ?
Thanks to ALL !
The answer lies somewhere between 10 and 50 per ml with a mean at 20. Making a self experiment is not so easy with costly and/or dangerous products... I just would like to improve on Ca titration using a serynge marked 0 to 200 (= 2ml)... Philippe "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe |
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#5
21-12-2003, 01:30 PM
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How many ml in a drop ?
Thanks to ALL !
The answer lies somewhere between 10 and 50 per ml with a mean at 20. Making a self experiment is not so easy with costly and/or dangerous products... I just would like to improve on Ca titration using a serynge marked 0 to 200 (= 2ml)... Philippe "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe |
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#6
21-12-2003, 01:30 PM
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How many ml in a drop ?
Thanks to ALL !
The answer lies somewhere between 10 and 50 per ml with a mean at 20. Making a self experiment is not so easy with costly and/or dangerous products... I just would like to improve on Ca titration using a serynge marked 0 to 200 (= 2ml)... Philippe "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe |
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#7
21-12-2003, 10:38 PM
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How many ml in a drop ?
"Philippe Lemaire \(remove oldies\)" wrote in message .be...
Thanks to ALL ! The answer lies somewhere between 10 and 50 per ml with a mean at 20. Making a self experiment is not so easy with costly and/or dangerous products... I just would like to improve on Ca titration using a serynge marked 0 to 200 (= 2ml)... Philippe "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe 20 drops per ml is the the most used amount I've seen. But those drop do vary  Doubt it'll make or break any dosing routine you might have in mind. Regards, Tom Barr |
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#8
22-12-2003, 08:12 PM
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How many ml in a drop ?
" wrote in message
om... "Philippe Lemaire \(remove oldies\)" wrote in message .be... Thanks to ALL ! The answer lies somewhere between 10 and 50 per ml with a mean at 20. Making a self experiment is not so easy with costly and/or dangerous products... I just would like to improve on Ca titration using a serynge marked 0 to 200 (= 2ml)... Philippe "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe 20 drops per ml is the the most used amount I've seen. But those drop do vary Doubt it'll make or break any dosing routine you might have in mind. Regards, Tom Barr Thanks ! I wanted to have a better precision measuring Ca... A first idea is to double the water and the first two reagents, then count every drop for half the Ca concentration ! These drops being done with a "cheap" bottle I would prefer to take the titration liquid in the 2 ml syringe and the read the value... Do you mean I have to be also very precise with the NaOH quantity I put at the beginning ? Regards, Philippe |
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#9
24-12-2003, 12:33 AM
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How many ml in a drop ?
"Philippe Lemaire \(remove oldies\)" wrote in message ...
" wrote in message om... "Philippe Lemaire \(remove oldies\)" wrote in message .be... Thanks to ALL ! The answer lies somewhere between 10 and 50 per ml with a mean at 20. Making a self experiment is not so easy with costly and/or dangerous products... I just would like to improve on Ca titration using a serynge marked 0 to 200 (= 2ml)... Philippe "Philippe Lemaire (remove oldies)" wrote in message e... Dear all, Does anyone has an idea ? is it really constant (when no viscosity is present) ? Or does it depend of the hole size ? Philippe 20 drops per ml is the the most used amount I've seen. But those drop do vary Doubt it'll make or break any dosing routine you might have in mind. Regards, Tom Barr Thanks ! I wanted to have a better precision measuring Ca... A first idea is to double the water and the first two reagents, then count every drop for half the Ca concentration ! These drops being done with a "cheap" bottle I would prefer to take the titration liquid in the 2 ml syringe and the read the value... Do you mean I have to be also very precise with the NaOH quantity I put at the beginning ? Regards, Philippe Well yes, but I don't think you are going to impriove to accuracy that much doing all this. You might count the drops with the dropper you plan on using and do some averages of 20 drops to volume. That would measure specifically what you are using as a ruler. Do sevral runs to see if things are repeated well. Regards, Tom Barr |
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#10
24-12-2003, 05:34 PM
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How many ml in a drop ?
" wrote in message om... "Philippe Lemaire \(remove oldies\)" wrote in message ... I wanted to have a better precision measuring Ca... A first idea is to double the water and the first two reagents, then count every drop for half the Ca concentration ! These drops being done with a "cheap" bottle I would prefer to take the titration liquid in the 2 ml syringe and the read the value... Do you mean I have to be also very precise with the NaOH quantity I put at the beginning ? Regards, Philippe Well yes, but I don't think you are going to impriove to accuracy that much doing all this. You might count the drops with the dropper you plan on using and do some averages of 20 drops to volume. That would measure specifically what you are using as a ruler. Do sevral runs to see if things are repeated well. Regards, Tom Barr Thanks ! Do you know whether the amount of NaOH is critical or not ? Seasons Greetings ! Philippe |
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