Richard Symes

7 Questions 39 Answers 0 Followers

Questions related from Richard Symes

Silver nanoparticle using dithionite. Anyone experienced?

I've been using sodium dithionite as a reducing agent for silver nanoparticle generation. It also appears to work for copper. However, I am trying to cap the nanoparticles with various molecules...

19 October 2022 5,287 2 View

What might cause false positive in thiocyanate determination?

I'm using the ferric ion spectrophotometric method for thiocyanate determination and seem to be getting false positive readings. The sample contains significant chloride which I am aware can...

25 March 2021 4,888 2 View

What is a suitable solvent for extraction of arsenic?

Hi. I'm doing some work on arsenic speciation. I am following a paper titled, "SPECIATION OF ARSENIC IN A CONTAMINATED SOIL BY SOLVENT EXTRACTION." which calls for the use of chloroform or benzene...

07 September 2020 6,528 4 View

Ammonia release from WBA exchange resin?

I'm trying to find literature on the release of ammonia from WBA type ion-exchange resins. I am currently using this resin for sulphate removal but it seems to be contributing a small amount of...

14 March 2017 8,877 4 View

Help with UV-Vis Spectrophotometer - Too light in compartment?

I'm using an Ultrospec 1000 UV-Vis Spectrometer. On startup it passes all the initial calibration tests until it gets to "Checking dark values" which fails. The display then shows "Too light in...

02 March 2016 1,463 14 View

Where can I find a protocol on the preparation of persilicate solution from hydrogen peroxide and sodium silicate?

Hi. I'm looking for a very general method to prepare a solution of persilicate from hydrogen peroxide and sodium silicate. Any information greatly appreciated.

09 September 2014 8,139 3 View

How can I overcome interference by a reducing agent when testing for thiocyanate with ferric ions?

I am testing solutions which contain thiocyanate, cyanide and an unknown reducing agent (probably an inorganic sulphur compound). The method uses ferric ions to form the red ferric-thiocyanate...

17 September 2012 1,884 4 View