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001-es BibID:	BIBFORM108395
Első szerző:	Balláné Kovács Andrea (vegyész)
Cím:	Néhány anion ionkromatográfiás meghatározása talaj- és növénymintákban = Determination of anions in soil and plant samples using ion chromatography / Balláné Kovács Andrea, Loch Jakab
Dátum:	2004
ISSN:	0002-1873 1588-2713
Megjegyzések:	Sample preparation and measurement methods suitable for serial measurements were elaborated for the determination of the NO3 - , SO4 2- and Cl- contents of soil and plant samples using single column ion chromatography. In the case of soil samples, the use of a 1:5 aqueous extract (1 h extraction time) was found to be the best method of sample preparation for serial measurements on the NO3 - , SO4 2- and Cl- contents, which could be measured simultaneously from the extracts. Although the soluble SO4 2- content of the soil could be measured equally well in aqueous and 0.01 M CaCl2 extracts, water was judged to be the best extracting agent, as this allowed the quantities of Cl- and NO3 - to be measured at the same time. An optimum method was also elaborated for the determination of the NO3 - , SO4 2- and Cl- contents in plant samples (wheat grains, wheat straw, strawberries). In correctly prepared aqueous extracts, NO3 - , SO4 2- and Cl- contents could again be successfully determined in parallel. Standard deviation was recorded to determine the reproducibility of ion chromatography measurements on soil and plant extracts. In all cases the CV% value characteristic of the deviation was below 11.45, and ranged from 1-6% in identical extracts. The applicability of the ion chromatography technique for determining the anion contents of soil and plant extracts was investigated with the help of recovery tests. In all cases a high percentage of the added ions was recovered.
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok magyar nyelvű folyóiratközlemény hazai lapban folyóiratcikk
Megjelenés:	Agrokémia és Talajtan. - 53 : 3-4 (2004), p. 391-400. -
További szerzők:	Loch Jakab (1932-2023) (kémikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM093160
Első szerző:	Prokisch József (vegyész)
Cím:	A talajban zajló króm(VI) redukció tanulmányozása ICP-hez kapcsolt ionkromatográffal / Prokisch J., Kovács B., Győri Z., Loch J.
Dátum:	1995
ISSN:	0002-1873 1588-2713
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok magyar nyelvű folyóiratközlemény hazai lapban folyóiratcikk
Megjelenés:	Agrokémia és Talajtan. - 44 : 1-2 (1995), p. 101-108. -
További szerzők:	Kovács Béla (1963-) (okleveles vegyész, angol szakfordító) Győri Zoltán (1948-) (vegyész) Loch Jakab (1932-2023) (kémikus)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM078013
035-os BibID:	(Scopus)85048935752
Első szerző:	Szabó Emese (biotechnológus)
Cím:	Relationship between the 0.01 M CaCl2- and AL-soluble soil phosphorus contents / Emese Szabó, László Huzsvai, Rita Kremper, Jakab Loch
Dátum:	2018
ISSN:	0002-1873 1588-2713
Megjegyzések:	The traditional Hungarian method for determining soil phosphorus (P) status is ammonium-lactate acetic acid (AL) extraction. AL is an acidic solution (buffered at pH 3.75), which is also able to dissolve P reserves, so there is a need for extraction methods that also characterize the mobile P pool. 0.01 M CaCl2-P is considered to directly describe available P forms, because the dilute salt solution has more or less the same ionic strength as the average salt concentration in many soil solutions. The amount of AL-P may be two orders of magnitude greater than that of CaCl2-P. Previous studies suggested that the relationship between AL-P and CaCl2- P was influenced by soil parameters. Regression analysis between AL-P and CaCl2- P showed medium or strong correlations when using soils with homogeneous soil properties, while there was a weak correlation between them for soils with heterogeneous properties. The objective of this study was to increase the accuracy of the conversion between AL-P and CaCl2-P, by constructing universal equations that also take soil properties into consideration. The AL-P and CaCl2-P contents were measured in arable soils (n=622) originating from the Hungarian Soil Information and Monitoring System (SIMS). These soils covered a wide range of soil properties. A weak correlation was found between AL-P and CaCl2-P in SIMS soils. The amounts and ratio of AL-P and CaCl2-P depended on soil properties such as CaCO3 content and texture. The ratio of AL-P to CaCl2-P changed from 37 in noncalcareous soils to 141 on highly calcareous soils. CaCl2-P decreased as a function of KA (plasticity index according to Arany), which is related to the clay content, while the highest AL-P content was found on loam soils, probably due to the fact that a high proportion of them were calcareous. The relationships between AL-P, CaCl2-P and soil properties in the SIMS dataset were evaluated using multiple linear regression analysis. In order to select the best model the Akaike Information Criterion (AIC) was used to compare different models. The soil factors included in the models were pHKCl, humus and CaCO3 content to describe AL-P, and KA, CaCO3 content and pHKCl to describe CaCl2-P. AL-P was directly proportional to pHKCl, humus and CaCO3 content, while CaCl2-P was inversely proportional to KA, CaCO3 content and pHKCl. The explanatory power of the models increased when soil properties were included. The percentage of the explained variance in the AL-P and CaCl2-P regression models was 56 and 51%, so the accuracy of the conversion between the two extraction methods was still not satisfactory and it does not seem to be possible to prepare a universally applicable equation. Further research is needed to obtain different regression equations for soils with different soil properties, and CaCl2-P should also be calibrated in long-term P fertilization trials.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény hazai lapban folyóiratcikk 0.01 M CaCl2 ammonium-lactate (AL) extractant phosphorus multiple regression
Megjelenés:	Agrokémia és Talajtan. - 67 : 1 (2018), p. 23-33. -
További szerzők:	Huzsvai László (1961-) (talajerőgazdálkodási szakmérnök, agrármérnök) Kremper Rita (1969-) (matematika-kémia tanár, angol szakfordító) Loch Jakab (1932-2023) (kémikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM093385
Első szerző:	Vágó Imre (vegyészmérnök)
Cím:	A növények nikkelfelvételének vizsgálata különböző talajokból tenyészedény kísérletekben / Vágó Imre, Loch Jakab, Győri Zoltán
Dátum:	1995
ISSN:	0002-1873 1588-2713
Tárgyszavak:	Agrártudományok Növénytermesztési és kertészeti tudományok magyar nyelvű folyóiratközlemény hazai lapban folyóiratcikk
Megjelenés:	Agrokémia és Talajtan. - 44 : 3-4 (1995), p. 435-440. -
További szerzők:	Loch Jakab (1932-2023) (kémikus) Győri Zoltán (1948-) (vegyész)
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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