SN blood test:
Blood test on SN requires fresh blood and
0.1g of SN powder, add 0.1g of the SN powder to the blood, blood color should change quickly within some seconds
Should turn dark-ish brown color.
As others have said, do the aquarium test, too.
SN aquarium purity testing mathematics
fundamental inputs :
v1 : volume of water in ml in bottle 1
v2 : volume of water in ml in bottle 2
w : weight of SN in mg
t : transferred volume of water in ml, from bottle 1 to 2
tc : target concentration in mg/ml
(see first post in this thread to understand what bottle 1 and 2 are, etc)
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derived values :
c1 : concentration of SN in mg/ml in bottle 1
c2 : concentration of SN in mg/ml in bottle 2
tw : transferred weight of SN in mg, from bottle 1 to 2
It should be easy to see that :
c1 = w / v1 [1]
tw = t * c1 [2]
c2 = tw / v2 [3]
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Combining [2] and [3] gives :
c2 = ( t * c1 ) / v2
Including [1] gives :
c2 = ( t * w / v1 ) / v2
c2 = ( t * w ) / ( v1 * v2 ) [4]
tc is the target value for c2, so we can re-state [4], as :
tc = ( t * w ) / ( v1 * v2 )
We can rearrange the above as needed, depending on which items are known, and which we are trying to determine. Doing that yields :
t = ( tc * v1 * v2 ) / w
w = ( tc * v1 * v2 ) / t
v1 = w * t / ( tc * v2 )
v2 = w * t / ( tc * v1 )
tc = w * t / ( v1 * v2 )
Using above equations, 4 things need to be known, and the 5th thing can be determined.
Pick the equation for the thing you want to determine. Example below shows how that works.
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Example 1 :
We've decided to use 1 litre of water in bottles 1 and 2, and use 2.0g of SN.
Our test kit can measure up to 10 mg/L
We've decided to "target" the middle of the test range, ie 5mg/L
How much transferred volume of water should I use ?
So our 4 known things are :
v1 = 1000 v2 = 1000 w = 2000 tc = 5 / 1000 = 0.005
(Convert from mg/L to mg/ml, so divide by 1000. Convert volumes to ml, and weight to mg, so those are multiplied by 1000)
t is what we're trying to determine, so use equation for t :
t = ( tc * v1 * v2 ) / w
So :
t = ( 0.005 * 1000 * 1000 ) / 2000 = 2.5 ml
So, we've determined we should transfer 2.5 ml of water from bottle 1 to 2.
If the SN is 100% pure, then this should give a 5 mg/L result on the test kit.
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Example 1b) : As example 1), except :
We've decided to "target" the max of the test range, ie 10mg/L
tc = 10 / 1000 = 0.01
and :
t = ( 0.01 * 1000 * 1000 ) / 2000 = 5 ml
So, we would transfer 5 ml of water from bottle 1 to 2.
If the SN is 100% pure, then this should give a 10 mg/L result on the test kit.
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Example 2 :
We've decided to use 1 litre of water in bottles 1 and 2, and to transfer 10ml of water
Our test kit can measure up to 10 mg/L
We've decided to "target" the middle of the test range, ie 5mg/L
How much SN should I use ?
v1 = 1000 v2 = 1000 t = 10 tc = 5 / 1000 = 0.005
w = ( tc * v1 * v2 ) / ( 2 * t )
w = ( 0.005 * 1000 * 1000 ) / 10 = 500 mg = 0.5g
If the SN is 100% pure, then we should see 5 mg/L on the test kit.
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Example 2b) : As example 2), except :
We've decided to "target" the max of the test range, ie 10mg/L
tc = 10 / 1000 = 0.01
and :
w = ( 0.01 * 1000 * 1000 ) / 10 = 1000 mg = 1.0g
If the SN is 100% pure, then we should see 10 mg/L on the test kit.
For more information regarding purity mathematics, refer the below link
https://sanctioned-suicide.net/threads/sn-aquarium-purity-testing.34630/
Also: