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Chemical Stability and Compatibility

 
 

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Choosing best matrix for diluted standards
Could you please send me instructions how to dilute the QCP-QCS-1 multi-element metal standard? Is 5% nitric acid or distilled water better for dilution, particularly for measuring ppm (~30) levels of As?
Created: 09/02/18 22:22:53
Created By: "admin"
1 2196
Choosing best matrix for diluted standards
Could you please send me instructions how to dilute the QCP-QCS-1 multi-element metal standard? Is 5% nitric acid or distilled water better for dilution, particularly for measuring ppm (~30) levels of As?
Posted: 09/02/18 22:23:55
Mercury (Hg) preservation at low (<100 ppm) concentrations
Can you please explain the reason why Hg (concentration <100 ppm) should stored in borosilicate glass if the matrix is HNO3? Is the main reason the adsorption of Hg on the wall of plastic containers? Do you recommend Hg in HCl?
Created: 09/02/18 22:19:49
Created By: "admin"
1 2392
Mercury (Hg) preservation at low (<100 ppm) concentrations
Can you please explain the reason why Hg (concentration <100 ppm) should stored in borosilicate glass if the matrix is HNO3? Is the main reason the adsorption of Hg on the wall of plastic containers? Do you recommend Hg in HCl?
Posted: 09/02/18 22:21:30
Mixing stock products CMS-4 and CMS-5
Is it possible to mix together certain volumes of the hot plasma (CMS-4-125ML) and the cool plasma (CMS-5-125ML) products to target the elements present in both? Or will the solutions not be stable if mixed?
Created: 09/02/18 22:16:47
Created By: "admin"
1 2293
Mixing stock products CMS-4 and CMS-5
Is it possible to mix together certain volumes of the hot plasma (CMS-4-125ML) and the cool plasma (CMS-5-125ML) products to target the elements present in both? Or will the solutions not be stable if mixed?
Posted: 09/02/18 22:17:24
Aqua regia stability
I want to make aqua regia with 1 parts of nitric acid and 3 parts of hydrochloric acid for testing gold purity, but I can't keep it stable for a long time. Can you please help me with this problem?
Created: 09/02/18 22:14:52
Created By: "admin"
1 4284
Aqua regia stability
I want to make aqua regia with 1 parts of nitric acid and 3 parts of hydrochloric acid for testing gold purity, but I can't keep it stable for a long time. Can you please help me with this problem?
Posted: 09/02/18 22:15:41
Tin (Sn) products in different acid matrices
I have a question with regards to a standard, I need to order a tin (Sn) standard, but am not sure which one I need. There are two different Sn standards, one is listed as CGSN1, and the other is CGSNCL1. Why would SnCl be used instead of Sn, and visa versa?
Created: 09/02/18 22:12:10
Created By: "admin"
1 2756
Tin (Sn) products in different acid matrices
I have a question with regards to a standard, I need to order a tin (Sn) standard, but am not sure which one I need. There are two different Sn standards, one is listed as CGSN1, and the other is CGSNCL1. Why would SnCl be used instead of Sn, and visa versa?
Posted: 09/02/18 22:13:12
Mercury (Hg) stability in dried samples
I work as a technical manager for an analytical laboratory. We have had a controversy regarding drying samples at 105°C prior to analysis if we are to determine mercury on the dried material. Despite the fact the boiling points of various mercury compounds are > 300°C, we were still wary we could be losing some of the element. We decided to test this. We dried the following forms of mercury, solubilized dried material, and analyzed the concentration after drying. · Mercury Nitrate Monohydrate (solid standard) – 93 % Recovery· Mercury Dichloride (solid standard) – 41 & 19 % Recovery· Mercury Liquid Standard, in 2 % HCl, HgCl2 Source – 0 % Recovery· Mercury Liquid Standard, in 12 % HNO3, Hg Metal Source – 99.8 % Recovery. Do any one of you know why only the mercury dichloride sources volatilized at 105°C, despite the fact the mercury dichloride BP is 304°C?
Created: 09/02/18 22:09:44
Created By: "admin"
1 2363
Mercury (Hg) stability in dried samples
I work as a technical manager for an analytical laboratory. We have had a controversy regarding drying samples at 105°C prior to analysis if we are to determine mercury on the dried material. Despite the fact the boiling points of various mercury compounds are > 300°C, we were still wary we could be losing some of the element. We decided to test this. We dried the following forms of mercury, solubilized dried material, and analyzed the concentration after drying. · Mercury Nitrate Monohydrate (solid standard) – 93 % Recovery· Mercury Dichloride (solid standard) – 41 & 19 % Recovery· Mercury Liquid Standard, in 2 % HCl, HgCl2 Source – 0 % Recovery· Mercury Liquid Standard, in 12 % HNO3, Hg Metal Source – 99.8 % Recovery. Do any one of you know why only the mercury dichloride sources volatilized at 105°C, despite the fact the mercury dichloride BP is 304°C?
Posted: 09/02/18 22:10:29
Mercury (Hg) stability in dried samples
I work as a technical manager for an analytical laboratory. We have had a controversy regarding drying samples at 105°C prior to analysis if we are to determine mercury on the dried material. Despite the fact the boiling points of various mercury compounds are > 300°C, we were still wary we could be losing some of the element. We decided to test this. We dried the following forms of mercury, solubilized dried material, and analyzed the concentration after drying. · Mercury Nitrate Monohydrate (solid standard) – 93 % Recovery· Mercury Dichloride (solid standard) – 41 & 19 % Recovery· Mercury Liquid Standard, in 2 % HCl, HgCl2 Source – 0 % Recovery· Mercury Liquid Standard, in 12 % HNO3, Hg Metal Source – 99.8 % Recovery. Do any one of you know why only the mercury dichloride sources volatilized at 105°C, despite the fact the mercury dichloride BP is 304°C?
Created: 09/02/18 22:08:16
Created By: "admin"
0 0
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Mercury (Hg) stability at 1000 ppm
I would like a standard that contains all of the following elements at 1000 mg/L (ppm), but we have experienced problems with Hg, in that its concentration seems to decrease with time. Would Hg be stable in this standard? (Li), (Be), (Sc), (V), (Cr), (Mn), (Co), (Ni), (Cu), (As), (Rb), (Sr), (Ag), (Cd), (In), (Cs), (Ba), (Hg), (Tl), (Pb), (Bi), (Th), (La), (Ce), (Pr), (Nd), (Dy), (Er), (Eu), (Gd), (Ho), (Lu), (Sm), (Tb), (Tm), (Y), (Yb)
Created: 09/02/18 22:02:14
Created By: "admin"
1 2719
Mercury (Hg) stability at 1000 ppm
I would like a standard that contains all of the following elements at 1000 mg/L (ppm), but we have experienced problems with Hg, in that its concentration seems to decrease with time. Would Hg be stable in this standard? (Li), (Be), (Sc), (V), (Cr), (Mn), (Co), (Ni), (Cu), (As), (Rb), (Sr), (Ag), (Cd), (In), (Cs), (Ba), (Hg), (Tl), (Pb), (Bi), (Th), (La), (Ce), (Pr), (Nd), (Dy), (Er), (Eu), (Gd), (Ho), (Lu), (Sm), (Tb), (Tm), (Y), (Yb)
Posted: 09/02/18 22:03:05
Creating multi-element standards
My intention is to make: 1) multi-element standards in 2% HNO3 in glass from 1000 ppm stocks of: Ag, As, B, Be, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, P, Pb, S, Se, Sr, Tl, V, Zn + Mo, Sn, Sb from 100 ppm solution in 2% HNO3; 2) separate Hg standards in 7% HNO3; 3) multi-element standards in 2% HNO3 in plastic from 1000 ppm stocks of: Ba, Ca, Al. For the elements I have listed above, does this seem reasonable? Any other advice or consideration I am missing?
Created: 09/02/18 21:59:51
Created By: "admin"
1 3203
Creating multi-element standards
My intention is to make: 1) multi-element standards in 2% HNO3 in glass from 1000 ppm stocks of: Ag, As, B, Be, Cd, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, P, Pb, S, Se, Sr, Tl, V, Zn + Mo, Sn, Sb from 100 ppm solution in 2% HNO3; 2) separate Hg standards in 7% HNO3; 3) multi-element standards in 2% HNO3 in plastic from 1000 ppm stocks of: Ba, Ca, Al. For the elements I have listed above, does this seem reasonable? Any other advice or consideration I am missing?
Posted: 09/02/18 22:00:50
Stability of Ta and Nb upon dilution
Hi-I'm having trouble with diluting a custom standard, and I believe that your preparation is fine- I just can't get the elements calibrated by ICPMS. Most of the elements (V,Ce, Hf, Nb, Th, Y, Yb, & Zr) calibrate just fine. Unfortunately, I can't get successive dilutions of the standard to give linear calibrations for Ta & Nb, regardless of repeated preparation, the isotope monitored, or immediate use of freshly prepared standards. Since your company has mastered keeping these elements in solution, could you offer some advice as to how to keep the Ta & Nb "well behaved" while using your standard? Would a complexing agent help? I've been using 2% nitric; while your standard is in 5% nitric + trace HF. Could I get away with using 5% nitric without the trace HF and expect good behavior?Any advice you could offer would help.
Created: 09/02/18 21:55:16
Created By: "admin"
1 2444
Stability of Ta and Nb upon dilution
Hi-I'm having trouble with diluting a custom standard, and I believe that your preparation is fine- I just can't get the elements calibrated by ICPMS. Most of the elements (V,Ce, Hf, Nb, Th, Y, Yb, & Zr) calibrate just fine. Unfortunately, I can't get successive dilutions of the standard to give linear calibrations for Ta & Nb, regardless of repeated preparation, the isotope monitored, or immediate use of freshly prepared standards. Since your company has mastered keeping these elements in solution, could you offer some advice as to how to keep the Ta & Nb "well behaved" while using your standard? Would a complexing agent help? I've been using 2% nitric; while your standard is in 5% nitric + trace HF. Could I get away with using 5% nitric without the trace HF and expect good behavior?Any advice you could offer would help.
Posted: 09/02/18 21:56:42