Preparation and evaluation of soil in-house reference materials for some macro and micronutrients

Date

4-2008

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Katherine Anne C. Israel

Co-adviser

Josefina L. Solivas

Abstract

Soil In-House Reference Materials (IRM) of different types namely acidic, neutral and basic were prepared and evaluated for macro- mid micronutrient analysis. Homogeneity and stability tests for each soil type were conducted. Inter-laboratory comparison was attempted by 2 soil laboratories to evaluate the 'assigned' values obtained for 2 soil parameters. Sample homogeneity was evaluated by analyzing the K content of the soils. Results from Levene's statistical test (a=0.05) showed that the 3 soils are homogenous with P values > 0.05. The stability of the soil IRMs was evaluated at three different temperatures: 0°C, 27-30°C and 60°C. The parameters used were phosphorus, potassium, calcium, magnesium, sodium, zinc, iron, manganese and copper. Scheffe's statistical test was used for stability comparison. Most of the results for macronutrient (P, K, Ca, Mg and Na) analysis showed that there was no significant difference in the concentration of macronutrients for soil sample stored at 0°C and 27-30 °C. However, there is significant difference on the concentration of macronutrient for soil sample stored at 60°C. This indicates that the prepared soil in-house reference material can be used for macronutrient analysis stored at either 0°C or 27-30 °C but not at 60°C. For micronutrient analysis (Cu, Mn, Fe, Zn), most of the results showed that temperature

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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