József Prokisch, Dóra Hovánszky, Éva Széles, Béla Kovács, Zoltán Győri University of Debrecen, Centre of Agricultural Sciences, Institute of Food Science, Quality Assurance and Microbiology 4032 Debrecen Böszörményi út 138. Hungary Inhomogeneity of the agricultural soils in Hungary Basic terms: Homogenous, heterogenius, inhomogenous Inhomogenity, Guide to the expression of uncertainty in measurement (GUM) Representative sampling Question of this study: What is the real inhomogeneity of our soils in the practice?
13
Embed
József Prokisch, Dóra Hovánszky, Éva Széles, Béla Kovács, Zoltán Győri University of Debrecen, Centre of Agricultural Sciences, Institute of Food Science,
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
József Prokisch, Dóra Hovánszky, Éva Széles, Béla Kovács, Zoltán Győri
University of Debrecen, Centre of Agricultural Sciences, Institute of Food Science, Quality Assurance and Microbiology 4032 Debrecen Böszörményi út 138. Hungary
Inhomogeneity of the agricultural soils in Hungary
Basic terms:
Homogenous, heterogenius, inhomogenousInhomogenity, Guide to the expression of uncertainty in measurement (GUM)Representative sampling
Question of this study:What is the real inhomogeneity of our soils in the practice?
Bottle with the certified reference material.Mass: 1.00 gParticle size distribution and concentration distribution are same than the real sample.
Sample intake for the measurement. Sample mass: (e.g.) ~10 mgConcentration of sample is calculated from analyte concentration in the individual particles
particle
analyte
Bottle with the certified reference material.Mass: 1.00 gParticle size distribution and concentration distribution are same than the real sample.
Sample intake for the measurement. Sample mass: (e.g.) ~10 mgConcentration of sample is calculated from analyte concentration in the individual particles
particle
analyte
0
0.5
1
1.5
2
2.5
1 10 100 1000
particle size [µm]
den
sity
dis
trib
uti
on q
3lg(
x)
"Sample A"
"Sample B"
"Sample C"
0
50
100
150
200
250
300
350
400
0 100 200 300 400 500
particle size [µm]
CD
NA [µ
g/m
L]
60
80
100
120
140
160
180
0.01 0.1 1 10 100
sample mass [mg]
CD
NA
[µ
g/m
l]
Sample CSample BSample A
The scale and theinhomogeneity
0
50
100
150
200
250
300
0 100 200 300 400 500 600
0
50
100
150
200
250
0 100 200 300 400 500 600
JPconv.exe
0
50
100
150
200
250
1 201 401 601
0
50
100
150
200
250
1 201 401 601
0
50
100
150
200
250
1 201 401 601
0
50
100
150
200
250
1 201 401 601
0
50
100
150
200
250
1 201 401 601
0
50
100
150
200
250
1 201 401 601
The scale and the measuredinhomogeneity
Questions of this study1. How many sample should I take from an arable field for getting results with a
certain confidence level?
2. Who is responsible for the uncertainity? Sampling or the laboratory? What is the acceptable uncertainity of a repeated measurement of soil from an arable field (5-30 ha)