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Chemical Stability and Compatibility

 
 

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Digesting an organic with Os Spike
Alternative to oxidizing-acid digestion
Created: 09/13/19 08:59:10
Created By: "Daniel Veit"
1 63
Digesting an organic with Os Spike
Alternative to oxidizing-acid digestion
Posted: 09/13/19 08:59:10
Stability of diluted standards
In our preparation for ICP-MS analysis of USP <232> elements, we perform an intermediate dilution of a 14 element blend. This is a 1:20 dilution to give concentrations (ug/mL, ppm) as follows: Cu = 65, Ni = 30, Mo = 9, V = 6, Cd = 0.25, Hg = 0.75, Pb = 0.25, As = 0.75, Ir = 5, Pd = 5, Pt = 5, Rh = 5, Ru = 5, Co = 2.5. I have viewed information at http://inorganicventures.com/stability-elements-ppb-concentration-levels, which has pointed me in the right direction and is the kind of information I’m looking for, except that our intermediate is at much greater concentrations. I am wondering if you can provide any information regarding the stability of this solution in a 5% nitric acid (HNO3), 1% hydrochloric acid (HCl) solution? If possible, I'm also interested in stability information for a 10 ug/L (ppb) mixture of In, Bi, 6-Li, Y, Sc, and Tb in 3% HNO3.
Created: 09/03/18 22:44:13
Created By: "admin"
1 239
Stability of diluted standards
In our preparation for ICP-MS analysis of USP <232> elements, we perform an intermediate dilution of a 14 element blend. This is a 1:20 dilution to give concentrations (ug/mL, ppm) as follows: Cu = 65, Ni = 30, Mo = 9, V = 6, Cd = 0.25, Hg = 0.75, Pb = 0.25, As = 0.75, Ir = 5, Pd = 5, Pt = 5, Rh = 5, Ru = 5, Co = 2.5. I have viewed information at http://inorganicventures.com/stability-elements-ppb-concentration-levels, which has pointed me in the right direction and is the kind of information I’m looking for, except that our intermediate is at much greater concentrations. I am wondering if you can provide any information regarding the stability of this solution in a 5% nitric acid (HNO3), 1% hydrochloric acid (HCl) solution? If possible, I'm also interested in stability information for a 10 ug/L (ppb) mixture of In, Bi, 6-Li, Y, Sc, and Tb in 3% HNO3.
Posted: 09/03/18 22:45:15
Amount of HF in stock standards
I need to know the exact concentration of HF in the CGHF1, CGNB1, and CGTA1 standards and if I can mix the three solutions.
Created: 09/03/18 22:40:00
Created By: "admin"
1 170
Amount of HF in stock standards
I need to know the exact concentration of HF in the CGHF1, CGNB1, and CGTA1 standards and if I can mix the three solutions.
Posted: 09/03/18 22:41:32
Molybdenum and titanium stability; mercury volatility
Are Mo and Ti are stable for any length of time without using HF? Also, what is meant by the term "trace HF"? I also have a question about mercury (Hg).I've noticed that hot block digestions of a clean acid-water matrix with an inorganic mercury standard added to a final concentration of 0.5ug/L, result in mercury recoveries ranging from 75-80%. Is inorganic mercury is volatile enough to explain such a loss?
Created: 09/03/18 22:35:52
Created By: "admin"
1 160
Molybdenum and titanium stability; mercury volatility
Are Mo and Ti are stable for any length of time without using HF? Also, what is meant by the term "trace HF"? I also have a question about mercury (Hg).I've noticed that hot block digestions of a clean acid-water matrix with an inorganic mercury standard added to a final concentration of 0.5ug/L, result in mercury recoveries ranging from 75-80%. Is inorganic mercury is volatile enough to explain such a loss?
Posted: 09/03/18 22:38:16
Contaminants of ethanol in HDPE
We're working on a health problem that we assume was caused by an unidentified contaminant in ethanol. The ethanol was 96%, shipped in 50 gallon HDPE barrels, and then diluted with water to 36% for drinking. We wonder if a possible source for a toxic contaminant might be a substance in the polyethylene matrix. What substances present in HDPE could be leached out by 96% ethanol?
Created: 09/03/18 22:31:06
Created By: "admin"
1 143
Contaminants of ethanol in HDPE
We're working on a health problem that we assume was caused by an unidentified contaminant in ethanol. The ethanol was 96%, shipped in 50 gallon HDPE barrels, and then diluted with water to 36% for drinking. We wonder if a possible source for a toxic contaminant might be a substance in the polyethylene matrix. What substances present in HDPE could be leached out by 96% ethanol?
Posted: 09/03/18 22:33:42
Lead (Pb) instability in HNO3
I am using CGPB1, a 1000 microgram/ml Pb standard, and I made up a set of standards to test for Pb in some water samples. My standards were 1, 0.5, 0.1, and 0.01 ppm. I acidified them with 2% v/v HNO3, the remainder being DI water. The standards seem to be extremely unstable, I can't get even a single sample run through my ICP with them. Any thoughts?
Created: 09/03/18 22:28:18
Created By: "admin"
0 65
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Starting materials for Kjeldahl nitrogen, COD, and suspended solids
I need information for standards for Total Nitrogen (Kjeldahl), COD, and Total Suspended Solids. For Total Nitrogen we combine two stock standards of 1000 mg/L N solution made from Potassium Nitrate, and 1000 mg/L N made from Ammonium Sulfate in equal parts and use this to make standards. For the QC we use a 1000 mg/L N solution made from Nicotinic acid. What starting materials do you use to prepare your stock products for these analytes? For COD we have 3 solutions that are all made from KHP, and for TSS we have a stock standard of 200 mg/L. What starting materials do you use to prepare your stock products for COD and TSS?
Created: 09/03/18 22:25:25
Created By: "admin"
2 149
Starting materials for Kjeldahl nitrogen, COD, and suspended solids
I need information for standards for Total Nitrogen (Kjeldahl), COD, and Total Suspended Solids. For Total Nitrogen we combine two stock standards of 1000 mg/L N solution made from Potassium Nitrate, and 1000 mg/L N made from Ammonium Sulfate in equal parts and use this to make standards. For the QC we use a 1000 mg/L N solution made from Nicotinic acid. What starting materials do you use to prepare your stock products for these analytes? For COD we have 3 solutions that are all made from KHP, and for TSS we have a stock standard of 200 mg/L. What starting materials do you use to prepare your stock products for COD and TSS?
Posted: 09/03/18 22:29:54
Stability and changes in certified values with time
I would like to know about the stability and the possible change in concentration with time expected for your certified standards?
Created: 09/03/18 22:22:34
Created By: "admin"
1 143
Stability and changes in certified values with time
I would like to know about the stability and the possible change in concentration with time expected for your certified standards?
Posted: 09/03/18 22:24:03
Element ratios between standards and samples for soils and seeds
I am a graduate student looking to acquire a custom multielement standard for my project, which is looking at the relationship of the metal content of the soil profile and plant seed material in order to determine the region at which the seed was sampled from. I intend to most of the analysis on an ICP-MS instrument and maybe an ICP-OES for the major elements, so ideally I want a multielement standard which contains: Mg, Al, Ca,Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Sr, Rb, Mo, Cd, Sn, Sb, Ba, Hg, and Pb. When designing a multielement standard, is it better to make up all the analytes at the same concentration, or vary their concentrations to trends you expect to see? (eg. I'd expect the Mg, Fe, Al and Ca content of the soils to be much larger than the seeds).
Created: 09/03/18 22:19:58
Created By: "admin"
1 132
Element ratios between standards and samples for soils and seeds
I am a graduate student looking to acquire a custom multielement standard for my project, which is looking at the relationship of the metal content of the soil profile and plant seed material in order to determine the region at which the seed was sampled from. I intend to most of the analysis on an ICP-MS instrument and maybe an ICP-OES for the major elements, so ideally I want a multielement standard which contains: Mg, Al, Ca,Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Sr, Rb, Mo, Cd, Sn, Sb, Ba, Hg, and Pb. When designing a multielement standard, is it better to make up all the analytes at the same concentration, or vary their concentrations to trends you expect to see? (eg. I'd expect the Mg, Fe, Al and Ca content of the soils to be much larger than the seeds).
Posted: 09/03/18 22:21:09
HF concentrations in multi-element standards
Some ICP standards are specified as preserved in HNO3 and trace HF, such as molybdenum and titanium in multi-element mixed standards. Can you provide more information about the actual concentrations of HF used by Inorganic Ventures?
Created: 09/03/18 22:17:26
Created By: "admin"
1 228
HF concentrations in multi-element standards
Some ICP standards are specified as preserved in HNO3 and trace HF, such as molybdenum and titanium in multi-element mixed standards. Can you provide more information about the actual concentrations of HF used by Inorganic Ventures?
Posted: 09/03/18 22:18:22