Toan Nguyen-Sy

4 Questions 5 Answers 0 Followers

Questions related from Toan Nguyen-Sy

How long we can keep soil water extraction in refrigerator (4oC) ?

I plan to extract soil by cold and hot water for measuring water extraction carbon and nitrogen (WEC and WEN). Since I have lot of samples so I am thinking of store extractions (liquid) at 4oC in...

08 August 2017 6,249 6 View

Any changes in soil dissolved organic matter if we conduct second time extraction by hot/cold water?

I now extract 20 gram soil by hot/cold water by 30 mins shaking and 30 mins centrifuge. One of the parameters for analysis is δ 13C. I need to freeze dry extract to get the solid matter for...

07 July 2016 8,330 3 View

What causes red color appearance of the extracts after extracting soils by KCl?

I extracted soil samples from rice paddy long-term experiment by KCl10% after 4 week-anaerobic incubation (30 degree Celsius) and found that extract solutions of samples since 1983-1990 had been...

12 December 2015 9,023 15 View

Can I store soil extractions in refrigerator in several weeks and then measure NH4+ and NO3- production (soils were extracted by KCl) ?

It relates to my time series experiment. I am now conducting 32 year-experiment and got a lot of soil samples. All the samples were extracted by KCl and then stored in refrigerator since I...

11 November 2015 829 18 View