12 Questions 15 Answers 0 Followers
Questions related from Saman Jayasena
Can someone send the 24th edition of standard methods for the analysis of water and wastewater (APHA) ?
06 June 2023 1,647 0 View
Is there any guideline to determine the validity period of a calibration curve ( How often it should be updated/how long can use a calibration curve( some methods, for example, sulphate...
27 March 2023 4,386 3 View
this is regarding nitrate determination by 4500-NO3 B. Ultraviolet Spectrophotometric Screening Method. when the organic matter content is high, can we use an Allum solution to precipitate the...
25 October 2022 6,422 2 View
we use APHA 4500 SiO2 C:2017 method for silica determination. once we digest the sample and then colour develop to get the absorbance. when we keep more time ( we have to measure the absorbance...
22 September 2022 6,629 0 View
Dear friends, this is regarding Total Dissolved Solids test. when we have a oil mixed sample how do we analyze TDS? when sample is filtered through a glass micro fiber filter paper, oil in the...
05 November 2020 5,285 3 View
We are using ICP OES for analyse metals. According to APHA 3120 B we can analyse most of the metals except Sn (Tin). Tin can analyse with APHA 3113B method. Why Tin can't analyse with 3120B...
26 June 2020 5,905 2 View
dear friend, RSC= (CO32-+HCO3-) - (Ca2++ Mg2+) can anybody explain how to calculate the residual sodium carbonate? it is appreciated if you could provide with an example calculation....
19 November 2019 4,868 7 View
dear friends, when the analysis of dairy wastewater ( from milk industry) for oil and grease by partition gravimetric method (extraction with n- hexane) according to APHA 5520 B method, how can...
22 August 2019 3,742 3 View
Dear friend, in kjeldahl method, at the distillation step, we have to use NaOH solution,. in this solution we have sodium thiosulphate. what is the purpose of adding sodium thiosulphate?
30 May 2019 9,533 2 View
we have measured well water samples containing high level of alkalinity, chloride, hardness and TDS ( this area soil contains dolamite (Matale area)) but the problem is conductivity is 20 µS/cm...
11 March 2019 2,600 3 View
Dear friends, what is the acceptance criteria for duplicate analysis results, Standard methods for the examination for water and wastewater guideline for solids analysis is (TSS, TDS,...
14 January 2019 1,355 3 View
for a given analytical method, we have to find out the minimum detectable limit /Limit of Detection). below that value, we can say" not detected). i want to know, how to find a detection level...
28 November 2017 1,269 8 View
