Determination of zinc in soil using colorimetry

Quimica nova

Rezende, Maria Olímpia Oliveira¹  Crespilho, Frank Nelson¹  Fraige, Karina¹ 

[1] Universidade de São Paulo, São Carlos, Brasil

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 soilfertility, zinc is a micronutrient that is very important in the culture ofsoy, maize, rice and coffee, because it is a structural and functional componentof a great number of enzymes. Therefore, diverse methods have been used to determinezinc in soil. In this work we use colorimetry as a methods of zinc determinationin soil using two methodologies of sample digesting, H2SO4/H2O2and HNO3/H2O2. In order to compare the results,atomic absorption spectrometry (AAS) was used. Results show that colorimetricmethods can be used due to good sensitivity and reproducibility, since the zinccalibration curve showed good linearity. Comparing colorimetric methods withAAS we observed that the results were equivalent, as proven by the statisticalvalues of the F and t of Student tests. Furthermore, both methods of soil digestingcan be used, leading to a flexible methodology of low-cost for routine zincanalyses in soil.

【 授权许可】

CC BY