Hello Bormes.
First I want to thank you for all your testing as I was hoping someone would perform similar testing to confirm or not, the shot-glass method testing I have done and continue to perform. I have learned a lot along the way and perhaps I can relate some of that information to you.
I began testing, along with Michael Harrah, about 1 year ago. We both were getting inconsistent results and needed to find out why. Both of us used LaMotte high range ClO2 test strips and eXact Chlorine Photometers. There are pitfalls when using either one of those test devices.
1. Always use distilled water. If you don't, you will not get accurate results.
2. When reading the test strips, dilute the test solution so the colors fall mid-range, because your eye can see differences more easily than when trying to read at the high end of the color scale.
3. We found using the dilution calculator at
endmemo.com/bio/dilution.php to be most useful.
4. I think the photometer is a better measurement tool if used properly.
5. The photometer I use requires the use of two reagent strips and both must be used to get accurate results.
6. The photometer reading must be above 40% or inaccurate readings will result. It took a while before we noticed that fine print and following that instruction made a big difference in obtaining accurate readings.
7. I have wondered if LaMotte ClO2 test strips would need the glycine reagent strips the photometer requires. Their purpose (as I recall) is to remove any free chlorine present so the DPD-1 reagent strips will give an accurate reading. A conversion chart is needed to read ClO2 with the photometer I use. The LaMotte test strips use a different technology, so they may not need the glycine reagent strips.
8. To compare your testing results, I suggest you calculate the amount of ClO2 in each CDS batch you measure. That way, you can then compare the efficiency of your methods by calculating the amount of ClO2 generated for every 1 ml of MMS used.
For instance, the first three tests listed in your first post would calculate:
Test one:
2 ml MMS into 180 ml distilled water: Concentration (ppm) x Volume (liters) = Dose (ClO2 mg) 250 ppm x 0.180 liters = 45 mg ClO2.
Conversion efficiency = dose / MMS = 45 / 2 = 22.5 mg/ml (22.5 mg ClO2 generated for each ml of MMS used)
That conversion efficiency is quite low for a shot-glass method perhaps because the receiver container and/or the reactor is too small. I have measured 104 mg/ml conversion efficiency using 2.5 ml MMS, but the receiver container was 2 liters volume and the reactor mouth was 90 mm in diameter. Bigger can be better for best efficiency. See photo.
www.mmsinfo.org/misc/ak_ah_1Ldw_2.5ml_mms1_2.5ml_50pcca_90mm_candle_holder.jpg
If you were using the two bottles, transfer tube, and heating method; an open-to-the-atmosphere system, I would expect to see 25 mg/ml efficiency. The Shot Glass method is a closed system with a 12 hour activation time period and there is less ClO2 loss because the receiver is not open to the atmosphere where ClO2 gas can easily escape. Perhaps your jar lid was leaking.
Test two:
2.5 ml MMS into 120 ml distilled water: Concentration (ppm) x Volume (liters) = Dose (ClO2 mg) 500 ppm x 0.120 liters = 60 mg ClO2.
Conversion efficiency = dose / mms = 60 / 2.5 = 24 mg/ml (24 mg ClO2 generated for each ml of MMS used)
Test three:
6 ml MMS into 144 ml distilled water: Concentration (ppm) x Volume (liters) = Dose (ClO2 mg) 1000 ppm x 0.144 liters = 144 mg ClO2.
Conversion efficiency = dose / mms = 144 / 6 = 24 mg/ml (24 mg ClO2 generated for each ml of MMS used)
So, all three of your tests resulted in an average conversion efficiency of 23.5 mg/ml.
Just posted a new shot-glass method PDF at MMSinfo.org that contains some charts that might be helpful to you.
www.mmsinfo.org/infosheets/cds_shot_glass_travel_kit.pdf
You mention that a 3 drop dose of activated MMS in 120 ml of water measures 25 ppm (3 mg ClO2). I thought that was true until I made some measurements. See:
www.mmsinfo.org/infosheets/mms1_ppm_vs_activation_time-3.pdf
The chart shows that for 20 seconds activation time using 3 drops of MMS and 3 drops of 50% citric acid, you generate about 8.5 ppm ClO2 in 120 ml of distilled water. If you activate 60 seconds or longer, you get about 17 ppm. Only 4% HCl comes close to 25 ppm. Interesting!
The unactivated MMS will continue to activate & release ClO2 in your stomach whereas CDS won't do that.
As Pam says, there are a lot of variables that effect the amount of ClO2 generated. Container volume and shape and surface area are probably the most important.
MMS and CDS are not the same chemical. MMS contains other ingredients that CDS does not. I am not sure you can fairly compare the two. But, we do know that CDS can work wonders. How about the lady who killed a cancerous breast tumor in two months time taking high doses of CDS? As more testimonials come in, we will know better how to dose with MMS and CDS.
It would be interesting to know your equipment setups and any other details or photos you may want to share.
Happy testing!