Determination of zinc in soil using colorimetry

Química Nova

Rezende, Maria Olímpia Oliveira¹  Universidade de São Paulo, São Carlos, Brasil¹  Crespilho, Frank Nelson¹  Fraige, Karina¹ 

关键词: zinc determination;    colorimetry;    micronutrient in soil.;   

DOI  :  10.1590/S0100-40422007000300016

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In terms of soil fertility, zinc is a micronutrient that is very important in the culture of soy, maize, rice and coffee, because it is a structural and functional component of a great number of enzymes. Therefore, diverse methods have been used to determine zinc in soil. In this work we use colorimetry as a methods of zinc determination in soil using two methodologies of sample digesting, H2SO4/H2O2 and HNO3/H2O2. In order to compare the results, atomic absorption spectrometry (AAS) was used. Results show that colorimetric methods can be used due to good sensitivity and reproducibility, since the zinc calibration curve showed good linearity. Comparing colorimetric methods with AAS we observed that the results were equivalent, as proven by the statistical values of the F and t of Student tests. Furthermore, both methods of soil digesting can be used, leading to a flexible methodology of low-cost for routine zinc analyses in soil.

【 授权许可】

Unknown