Study of zeolite anti-caking effects for fertilisers by 1H low-field NMR

被引:4
作者
Novotny, Etelvino H. [1 ]
de Oliveira-Silva, Rodrigo [2 ,3 ]
Mattos, Bianca B. [1 ]
Rech, Iona [1 ]
Galvosas, Petrik [4 ]
Bonagamba, Tito J. [2 ]
机构
[1] Brazilian Agr Res Corp Embrapa, Embrapa Soils, BR-22460000 Rio De Janeiro, RJ, Brazil
[2] Univ Sao Paulo, Sao Carlos Inst Phys, POB 369, BR-13560970 Sao Carlos, SP, Brazil
[3] Katholieke Univ Leuven, Dept Microbial & Mol Syst M2S, Ctr Membrane Separat Adsorpt Catalysis & Spect Sus, B-3001 Leuven, Belgium
[4] Victoria Univ Wellington, MacDiarmid Inst Adv Mat & Nanotechnol, Sch Chem & Phys Sci, Wellington 6005, New Zealand
基金
巴西圣保罗研究基金会;
关键词
Agglomeration; Humidity; TD-NMR; H-1 NMR Relaxometry; Powder consolidation; UREA; POWDER; WATER; CLINOPTILOLITE;
D O I
10.1016/j.jmr.2022.107264
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
Caking is associated with the consolidation of dry powder and granules, leading to losses of function and/or quality. It has been object of studies in the pharmaceutical, food and fertiliser areas since 19200s because of its significant impact on product quality and value. Caking has been described as a three-step event consisting of sorption-dissolution-recrystallisation phases and constitutes a critical factor in fertilisers losses during storage while also hampering fertiliser application. Current methods for the evaluation of water sorption dynamics are expensive, time-consuming and/or inaccurate. This manuscript describes an unprecedented application of low-field H-1 NMR relaxometry for the kinetic study of humidity uptake, in real-time, by urea mixed with different concentrations of an anti-caking agent (zeolite). The proposed method allows to follow the water uptake in different domains of the mixed fertiliser/zeolite samples. To our knowledge, this dynamic has not been observed and quantified so far in real-time. Furthermore, we presented the use of 2D-ILT for kinetic studies, being the first dimension the usual transverse relaxation and the second dimension the kinetic one. With this approach, the NMR relaxation times T-2 correlated to time constants associated with the uptake kinetics of the water. This method could be extended to several kinetic studies and experiments with temperature variation. Depending on the kinetics of the studied process, the kernel of the Laplace transform must be suitably adapted. (c) 2022 Elsevier Inc. All rights reserved.
引用
收藏
页数:7
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