Water Quality B/C

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lolliexdd
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Re: Water Quality B/C

Postby lolliexdd » March 26th, 2012, 4:17 pm

I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
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Re: Water Quality B/C

Postby 2win » March 26th, 2012, 6:24 pm

I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
Try distilled instead of deionized water...
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Re: Water Quality B/C

Postby lolliexdd » March 26th, 2012, 6:53 pm

Try distilled instead of deionized water...
Aren't they the same?
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Re: Water Quality B/C

Postby ptkid » March 26th, 2012, 7:06 pm

I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
Okay, so when I tried making that one it just doesn't work. The soinc.org people are just wrong. A simple straw and clay model cannot be that accurate and can easily break. You need to think more sophisticated like how you can make it more accurate. Experiment to get a good salinometer.


And they basically are the same (deionized and distilled water).
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Re: Water Quality B/C

Postby 2win » March 26th, 2012, 8:14 pm

Try distilled instead of deionized water...
Aren't they the same?
My understanding is that deionized water may still have some dissolved gases and such in it.... distilled water is pure water with no gasses or other particles/substances.

But yeah, the soinc one is pretty crappy. A team at my regionals made one last minute because they left theirs at home, and so... Yeahh, they didn't really get a good reading...
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Re: Water Quality B/C

Postby silentsage » March 27th, 2012, 8:47 am

I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
Okay, so when I tried making that one it just doesn't work. The soinc.org people are just wrong. A simple straw and clay model cannot be that accurate and can easily break. You need to think more sophisticated like how you can make it more accurate. Experiment to get a good salinometer.


And they basically are the same (deionized and distilled water).
I agree, the soinc one is innacurate, but you can firm the clay by lightly coating it in superglue. I've tried to find how to build and electronic one (they are legal), but no luck, anyone else?
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Re: Water Quality B/C

Postby ptkid » March 27th, 2012, 1:33 pm

I hope this hasn't been answered yet..

We've been having problems building a salinometer like the one they recommended we make, with a straw and clay. Every day that we test any of our salinometers (we've used 3 types of clay already) in tap water, they all float to a different line than the day before. We've even used deionized water instead of tap water to calibrate it, but we still have the same problem. Do any of you know how to fix this?
Okay, so when I tried making that one it just doesn't work. The soinc.org people are just wrong. A simple straw and clay model cannot be that accurate and can easily break. You need to think more sophisticated like how you can make it more accurate. Experiment to get a good salinometer.


And they basically are the same (deionized and distilled water).
I agree, the soinc one is innacurate, but you can firm the clay by lightly coating it in superglue. I've tried to find how to build and electronic one (they are legal), but no luck, anyone else?
same. I had no luck. I found out what I was doing was totally wrong so I just made the straw one more sophisticated.
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Previous National Champion in Green Generation and National Medalist in CJAP, Disease Detectives, Entomology, & Water Quality

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Re: Water Quality B/C

Postby rtunnel97 » March 27th, 2012, 7:14 pm

I made one a step up from the simple clay and straw, but still it isn't that accurate, i just know it :(
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Re: Water Quality B/C

Postby cngu23 » March 28th, 2012, 1:54 pm

I made one a step up from the simple clay and straw, but still it isn't that accurate, i just know it :(
Since you get the point for measuring to the nearest percent, should line spacings of around 2.5% be enough for a rough estimate?
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Re: Water Quality B/C

Postby 2win » March 28th, 2012, 3:22 pm

I made one a step up from the simple clay and straw, but still it isn't that accurate, i just know it :(
Since you get the point for measuring to the nearest percent, should line spacings of around 2.5% be enough for a rough estimate?
I thought I depended on the proctor, but I think that's good enough, since some people are doing 3% or more. 1% is a butt to mark off...
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