Agung Ghani

6 Questions 14 Answers 0 Followers

Questions related from Agung Ghani

How to screen bad data of trace metal concentration contained in aerosol?

I have a dataset of metal concentration from aerosol sample. I would like to screen "bad data" in order to increase the quality of dataset before doing further analysis. I'm wondering how to...

24 October 2021 2,245 2 View

How to get monthly average from data with 3 days or 1 week resolution?

I'm sorry for this silly question. I have a dataset of chemical composition from aerosol samples with sampling time resolution of 3 days, 1 week, and 2 week. I'm wondering how to get monthly mean...

20 October 2021 8,847 3 View

Why There Is Zero Contribution (Conc.) from Some Factors in PMF Source Apportionment Model?

I'm playing with PMF source apportionment model at the moment. However, I found zero contribution (conc.) from some factors. I have tried to reduce and increase the number of factor, this zero...

06 July 2021 2,181 2 View

Is it possible that non-sea salt fraction has negative value?

Hi, I'm trying to calculate sea salt and non sea salt fraction from water soluble ion data (anion and cation). I calculate sea salt fraction by using using ssNa+ as specific marker and knowing the...

30 December 2020 10,195 9 View

Blank Concentration Higher Than Sample Concentration from IC Measurement?

I am using the IC to measure the concentration of aerosol sample. The problem I got is the blank concentration is higher than the sample concentration. Thus, I can't correct sample concentration...

05 February 2020 4,172 18 View

What do you think if most EC concentration is zero and BC concentration is much higher than EC concentration?

Dear all, Currently, I am investigating the result of Black Carbon and Elemental Carbon measurement. The EC is analyzed using DRI, and BC is analyzed using Aethalometer AE33. In literature, I...

01 January 1970 9,381 0 View