Hello,--
I've discovered a garage full of old Shimadzu UV1200 spectrometers and I'm wondering whether they might be useful for my water quality monitoring project. Does anyone know some Nitrate protocols for this old beast that doesn't involve Cd reduction columns?
Thanks in advance,
Max
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It's the price with the emzymes...device cost is $65...it's in the paper...
• Stock Nitrate Solution: Dry KNO3 (potassium nitrate) in an oven for 24 hours at 105° C. Then dissolve 3.62 g of KNO3 in distilled water. Dilute to 500 mL in your 500 mL graduated cylinder using distilled water. Carefully swirl the solution to mix (do not shake). Store in a 500 ml bottle or jar. Label with masking tape (include date). This makes a 7200 mg/L KNO3 (or a 1000 mg/L nitrate nitrogen) solution. Note: To calculate nitrate nitrogen (NO3 -2 -N), take into account the molecular composition of KNO3 (the ratio of the molecular weight of N to KNO3 is 0.138): 7200 mg/L KNO3 x 0.138 @ 1000 mg/L nitrate nitrogen (N03-N).
• Standard Nitrate Solution: Measure 50 mL of the stock nitrate solution using the 100 mL graduated cylinder. Pour into the 500 mL graduated cylinder and dilute to 500 mL with distilled water. Carefully swirl the solution to mix. The result is a 100 mg/L nitrate nitrogen standard. Store in a 500 ml bottle or jar. Label with masking tape (include date). • Make a new stock nitrate solution each time a calibration is conducted if the stock solution has not been preserved. Standard nitrate solutions should be made fresh each time regardless of whether the stock solution has been preserved or not. The stock nitrate solution can be preserved and stabilized for up to six months using chloroform (CHCl3) if you have safe access to this chemical. To preserve a stock nitrate standard add 1 mL of CHCl3 to 500 mL of stock solution.
Hope this helps Dave H
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I wonder why they are using 2 leds and 2 detectors per channel?
Also I don't seem to see the microcontroller code on in the instructions.
As Nathan mentioned there is no pcb files. Definitely not a gold standard open plan.
As for selling it for $200, that sounds right if the materials cost $70 odd.
(If you want to know why, this from https://youtu.be/UwrkfHadeQQ e explains the economics of selling hardware).
Cheers,
Brian