Comments

Author Comment Last activity Moderation
Ag8n "The older usp method was based on hydrogen sulfide. This was later changed to a thioacetamide based test. This is better, but still not good. The..." | Read more » about 6 years ago
Ag8n "I like energy dispersive X-Ray florescence (EDXRF). It's non-distructive, low power, and relatively cheap. On the down side, it's hard to calibra..." | Read more » about 6 years ago
Ag8n "Madtinker- I've seen "universal" pH indicators before. Interesting, using them with the spectrometer. You would probably need to filter the water..." | Read more » about 6 years ago
Ag8n "In the lab where both epa and fda testing was done, we always used the turbidity meter. We used color comparison tubes, too, just not for turbidit..." | Read more » over 6 years ago
Ag8n "I'm very surprised. I've spent many hours analyzing incoming raw material ( often times clays) usually for heavy metals. Clays are often the sour..." | Read more » over 6 years ago
Ag8n "PH paper can have interferences. Oxidizers like bleach can mess them up. It doesn't take much (ppm). This should be rare but can happen around, sa..." | Read more » over 6 years ago
Ag8n "I was on Amazon and found a bunch of pH meters under $20. Supposedly good from 0-14 pH, but that is very unlikely. Still, for the cost, it would ..." | Read more » over 6 years ago
Ag8n "In this area (Ohio), at least, trace levels of hypochlorite ( bleach) work their way into the storm sewer. If you have a piece of red pH paper, b..." | Read more » over 6 years ago
Ag8n "You want to check the expiration date of the strips, first. If they are expired, throw them out. And beware. If you are using something like red ..." | Read more » over 6 years ago
Ag8n "I checked Amazon. There are several tds meters that also do conductivity for a price of under $20. Since a scientific model lists for about $1000,..." | Read more » over 6 years ago
Ag8n "Sorry. Truncated the internet address: Https://www.hydroponics.net/learn/debate_over_ec_and_tds.php " | Read more » over 6 years ago
Ag8n "Check out: Https://www.hydroponics.net/lear All tds meters are conductivity meters, but according to the article, they may not all use the same c..." | Read more » over 6 years ago
Ag8n "I think it is. Was hoping someone was more familiar than me. Different websites talk about charge and others about conductivity, which can be two..." | Read more » over 6 years ago
Ag8n "Thank you for the question. To answer this, you will have to go where no man has gone before. There are a number of concerns. For example, cdom..." | Read more » over 6 years ago
Ag8n "Very interesting article. Thank you for posting it. Could you give more details on the turbidimeter you have developed? Regards " | Read more » over 6 years ago