Determinação condutométria de carbonato residual do calcário aplicado no solo por análise em fluxo

Química Nova

Lilka Isuzu Kawazaki¹  Mario Miyazawa¹  Marcos Antonio Pavan¹  Julio Cezar Franchini¹ 

关键词: lime;    soil analysis;    FIA system;   

DOI  :  10.1590/S0100-40422000000400021

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate a flow injection system for determination of residual CO3(2-) in soil amended with lime material. It was used a closed system were the CO2 released from soil sample acidified with 0.5 mol L-1 HCl was capted in a 0.2 mol L-1 NaOH solution. After 16h the capted CO2 was determined by conductivimetry using a flow injection system. The results obtained by the proposed method were significantly correlated with those reported in soil samples used by the International Soil Analytical Exchange Programe. The regression equation was: y = 0.987x -- 0.075 r = 0.996, P > 0.01. For acid soils amended with CaCO3 the method showed a deviation error of 2.7%, detection limit was 0.077 mmol kg-1 of CO3(2-), and a recovery of 99.7% of the total CO3(2-) added in soil sample. The method was easily adapted for routine determination of residual CO3(2-) in soil samples with an analytical frequency of 40 samples per hour.

【 授权许可】

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