| 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 » | over 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 » | over 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 » | over 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 |