Geo
The you tubers are overdoing it to score brownie points?
Should do it for less than a min?
Too long saturates iron residue diluting any other heavy metal present provided it is coming from the water
My heading should have been tester not filter?
The iron is the anode and aluminum cathode
Test everything!
Yes
I am gonna scan my??x-ray exciter tube
I have a X ray generating tube with unknown anode material?
Sort of like biting the hand that feeds you
Taray
On Friday, October 30, 2020, 11:05 PM, GEOelectronics@... wrote:
Great idea on the reverse-osmosis water discharge!
Test everything!
Here's another great idea for collecting samples from water, a paper by?
"A Sensitive XRF Screening Method for Lead in Drinking Water"
A novel method for quickly and quantitatively measuring aqueous lead in drinking water has been developed. A commercially available activated carbon felt has been found to effectively capture lead from tap water, and partnered with X-Ray fluorescence (XRF) spectrometry, it provides quantitative measurement of aqueous lead in drinking water. Specifically, for a 2-liter volume of tap water, the linear range of detection was found to be from 1 ¨C 150 ppb, encompassing the current EPA limit for lead in drinking water (15 ppb). To make a reproducible and easy to use method for filtering, a 2L bottle cap with a 1.25 cm diameter hole was used for filtering. Utilizing this filtration method, 75 solutions from 0 ppb to 150 ppb lead gave a 91% sensitivity, 97% specificity, and 93% accuracy and all the misclassified samples fell between 10 and 15 ppb. This method has also proved reliable for detecting calcium as well as several other divalent metals in drinking water including copper, zinc, iron, and manganese.
Note- She has tested all sorts of premade activated charcoal felt sheeting to find one that is inexpensive and yet performs very well for those heavy metals. I can send the paper by email but can't post it online.
Geo
----- Original Message -----
From: taray singh via groups.io <sukhjez@...>
To:
[email protected]Sent: Fri, 30 Oct 2020 10:14:27 -0400 (EDT)
Subject: [XRF] Chinese water filter analysis
Hi guys
I am interested in drinking water quality testing and most drinking water test kits are not accurate.
They give positive readings on concentrated samples like sewage and not for trace elements in drinking water.
So I wanted to try out this interesting Chinese? gadget.
Search you tube for..?Water Electrolyzer (Quality Tester). The Most Dangerous Appliance Ever?
Negative comments being dangerous? and a scam.
I checked it out
There are 2 pairs of electrodes
A shiny aluminium and a dull? iron pair.
Repeated usage caused the? iron to rust.
Aluminium was confirmed? by exclusion being shiny,light,cheap and nondescript.
My drinking water? sample is RO? waste water .
This discharged RO waste water is about 4 times more concentrated than my tap water depending on machine cycling.
Concentrated means more residue better than plain tap water for analysis.
My 14 in 1test kit was basically negative? for heavy metals.
I tested this RO concentrated with this Chinese toy.
It produced a brownish residue as expected.
Collected it and allowed it dry on cap and a tissue.
This cap/tissue was analyzed with Xrf with Am241/Si pin detector.
True enough like the you tubers described there is Fe from galvanic reactions.
There appears to be Pb peak as well
I need to repeat this test with a thicker sample? to confirm .
Taray
.
?
