Technical Questions Forum

Whether you need detailed assistance or quick troubleshooting, Inorganic Ventures, the standardology experts, is here to help. We're eager to assist chemists with hundreds of topics ranging from problem elements to calculations. The links below showcase real-world technical problems along with solutions provided by our in-house experts.

Forum Total Topics Total Posts Latest Reply
134 142
Dissolving Rh with Sodium Perchlorate
I recently asked a question about dissolving Rh and now want to try one of the methods with sodium perchlorate. The bottle i have says to store and handle under inert gas and this wasn't mentioned in the method. Can you give me anymore information about moving forward with this procedure? I am wanting to dissolve a 1 gram sample. How much HCL and how much Sodium Perchlorate should be added?
Posted: 02/10/20 12:53:59
149 154
Concentration of Internal Standard
I have a question about the concentration of internal standard. We are using EPA 200.8 to analyze environmental water. I heard that "the concentration of Sc should be 100ppb and Y, In, and Tb is 20-30ppb.". Because we are using multi-element internal standard in ICP-MS, the concentrations of Sc, Y, In, and Tb are the same and I can't make like 100ppb Sc nad 20-30ppb others as what I heard. (1) Can you let me know why the concentration of IS should be different? (2) Please let me know why the concentration of Sc should be higher than others. Also, I heard that I have to use individual internal standard to make internal standard like below. "Sc can start at 50ppb: add 25ul to 500ml bottle or 50ul to 1L bottle. Spike in additional amounts until counts are 2.5-3.5M (guess total of 100ppb) All the other IS (Y, In, and Tb) start at 10ppb: add 5ul to 500ml bottle or 10ul to same 1L bottle. Spike in additional amounts until counts are around 500k (guessing 20-30ppb).". "This is for the optimization of internal standard." (3) Can you explain what is the optimization of internal standard, if you know? (4) Who can use the multi-element internal standard? Thanks and I am looking forward to hearing from you.
Posted: 07/24/20 12:18:45
81 83
Photometry and spectroscopy using IRAF and Pyraf
I have some large amount of fits files which I have to reduce(bias, flat, dark, and removal of cosmics) and then do photometry(both aperture and psf) and spectroscopy ( I know all the stuff of how to use iraf and do photometry and spectroscopy. I want to write some script in python which can automate the stuff to a reasonable extent. Can anyone suggest me some website or way how to write some script (in python) using iraf tasks like daophot , apall, apphot, imexam etc. so that I can do my work relatively faster.
Posted: 12/03/19 12:35:29
146 155
Antimony count unstable in ICP-OES
Instrument: ICP-OES Wavelength: Sb206.834 and Sb217.582 Product: CGSB1-125ml LOT# N2-SB665459 and P2-SB676727 the intensity of 1 and 10ppm Antimony solution from IV increased gradually when repeat injection from same solution. others element are fine. Inorganic Ventures 10ppm in Matrix is 0.07N + 0.8%HNO3 Inorganic Ventures 1ppm in Matrix is 0.07N + 0.08%HNO3 LOT# N2-SB665459 Trial 1: 2256 Trial 2: 2415 Trial 3: 2633 Trial 4: 2858 Trial 5: 3070 Trial 6: 3260 Trial 7: 3376 Trial 8: 3520 LOT# P2-SB676727 Trial 1: 2525 Trial 2: 2826 Trial 3: 3035 Trial 4: 3262 Trial 5: 3394 Trial 6: 3496 Trial 7: 3564 Trial 8: 3605
Posted: 02/25/20 08:42:15
7 11
ICP-MS Sample introduction
Hi, we have an ICP-MS 7800 and was running normally until a routine service was done. Nebulizer and chamber were cleaned by following Agilent Instructions. When we started the instrument an error appeared indicating poor sensitivity. We prepared new tune solution (1ppb) and check masses, but the problem persist. No leaks were detected. Your guidance will be appreciated.
Posted: 02/06/20 16:06:56