parts per million (1 Viewer)

[crammy90]

what are the steps to solving a ppm question.
do we just get everything in mg/l?
did any one's teachers teach them any hints????? tips that studfff

 

[minijumbuk]

You do it mass:volume, or volume:volume. It's basically what it sounds like: How many parts of that substance is in 1 million parts of that mixture?

Say you have 3mg of NaCl in 350 mL of soil

Then the ppm of NaCl will be 3 x 1/0.35 =8.57 ppm

 

[crammy90]

i dont quiet understand that.
i would have said ok so in that 350ml there are 3 ml NaCl
in 1 million parts there are x amount of NaCl
thus id derive:
3parts : xparts
350parts : 1E6
thus 3x1E6/350 = x
x = 8571ppm??
what does that achieve/ what is wrong with my logic

 

[danz90]

i dont quiet understand that.
i would have said ok so in that 350ml there are 3 ml NaCl
in 1 million parts there are x amount of NaCl
thus id derive:
3parts : xparts
350parts : 1E6
thus 3x1E6/350 = x
x = 8571ppm??
what does that achieve/ what is wrong with my logic

what minijumbuk is trying to explain is, is that:

if there were 3mg of NaCl in 350ml
Then how many mg of NaCl in 1L?
350mL=0.35L
hence, the 3mg/350ml is the same as: 3mg / 1/0.35 L

which equals 8.57mg/L =8.57ppm

Remember, simply: ppm = mg/L

 

[minijumbuk]

what minijumbuk is trying to explain is, is that:

if there were 3mg of NaCl in 350ml
Then how many mg of NaCl in 1L?
350mL=0.35L
hence, the 3mg/350ml is the same as: 3mg / 1/0.35 L

which equals 8.57mg/L =8.57ppm

Remember, simply: ppm = mg/L

Pretty sure it's a typo, but to avoid confusion, he meant 3mg x 1/0.35

 

[crammy90]

You do it mass:volume, or volume:volume. It's basically what it sounds like: How many parts of that substance is in 1 million parts of that mixture?

Say you have 3mg of NaCl in 350 mL of soil

ok i think i get it
so:
3mg : xmg
0.35L 1L

3mg x 1 : xmg
0.35L L
8.57 = xmg/l
there fore 8.57mg/L = 8.57ppm