Jan David

9 Questions 16 Answers 0 Followers

Questions related from Jan David

Is the separation of NaCl and NaHCO3 from piperazine on a HPLC HILIC column possible, with the further detection with ELSD?

- I need to analyze piperazine in an ultrapure water, but with 0.085 mol/L NaHCO3 & 0.040 mol/L NaCl matrix with pH set to 7 and to 3. - I have a HPLC–ELSD available, and can work according...

04 October 2024 134 0 View

Why rubbers get sticky through degradation/using?

Dear polymer science colleagues, Is there any short and sound peer-reviewed literature (paper/book) and a short answer why especially rubbers get by degradation and using sticky? Various polymers...

19 January 2023 5,914 2 View

Which Young's Modulus is possible for Jello (German version: Göttersspeisse) ?

Hi to all polymer physicists, is it possible, that E modulus of Jello (or it's German version "Göttersspeisse" - the protein content may differ) is, according to the concentrations of the Jello...

31 January 2019 4,545 3 View

Possible TGA pyrolysis products of potassium ferrocyanide K4[Fe(CN)6] ?

Hi all,could anyone give me a hint, in which pyrolysis products can potassium ferrocyanide K4[Fe(CN)6] (Yellow Prussiate of Potash) degrade? I would pyrolyze it to about 1100 °C in Ar flow a TGA...

04 February 2017 5,915 3 View

Are there any microwave digestion procedures for sulfides (e.g. Na2S, Ag2S) for further determination of S via ICP-OES ?

Hi, are there any microwave digestion/oxidation procedures for sulfides (e.g. Na2S, Na2Sx, Ag2S) for further determination of S via ICP-OES ?I need to do the digestion, since the sulfur in...

17 January 2017 8,424 2 View

Polyester fleece from PET and other poly(esters) ?

Are there any citable data, about how much of polar fleece [AKA polyester fleece, micro fleece, polar wool, vega wool, velo vool, plush, velours, Vlies, Plüsch...] fiber products [typically...

14 November 2016 9,466 3 View

Is there any (organic or inorganic) chemical, which is easily usable as a pyrolysis internal standard for TGA-MS?

Is there any (both organic or inorganic) chemical, which is easily usable as a pyrolysis "internal standard" for TGA-MS? So, it will not evaporate immediately when evacuating the TGA chamber, but...

07 July 2016 3,844 1 View

Standard of PET?

Is there any company or institution, which sells standards of a clean PET (without plasticizers, reinforcements, stabilizers, pigments)? Ideally in a pulverized form (particles in µm range, not...

02 October 2015 9,879 7 View

Can you answer my questions on sulfur compounds in domestic wastewater?

1) Do you know any more sulfur compounds, which are surely present in the wastewater (generally household wastewater) and city wastewater treatment plants [except H2S, methane-, ethane-, butane-...

19 November 2014 6,937 3 View