Determination of Calcium in Urine and Serum by Atomic absorption spectroscopy (AAS) (CAT#: STEM-ST-0159-WXH)

Introduction

Calcium is usually measured to screen for or monitor diseases of the bone or calcium regulation disorders (that is, diseases of the parathyroid gland or kidneys). Urinary calcium levels aid the clinician in understanding how the kidneys handle calcium in certain disease states involving calcium balance including diseases of the parathyroid gland. Urinary calcium levels are also essential in the medical evaluation of kidney stones.
Serum calcium is a blood test to measure the amount of calcium in the blood. Serum calcium is usually measured to screen for or monitor bone diseases or calcium-regulation disorders (diseases of the parathyroid gland or kidneys).

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Principle Applications Procedure Materials Notes Related Products

Principle

Atomic absorption spectrometry (AAS) detects elements in either liquid or solid samples through the application of characteristic wavelengths of electromagnetic radiation from a light source.
Atomic absorption spectroscopy (AAS) is based upon the principle that free atoms in the ground state can absorb light of a certain wavelength. Absorption for each element is specific, no other elements absorb this wavelength.

Applications

Atomic absorption spectrometry (AAS) is an easy, high-throughput, and inexpensive technology used primarily to analyze elements in solution. As such, AAS is used in food and beverage, water, clinical research, and pharmaceutical analysis.

Procedure

1. Creating a steady state of freely dissociated ground state atoms using a heat source (flame)
2. Passing light of a specific wavelength through the flame. The wavelength corresponds to the amount of energy required to excite an electron from (typically) the ground to first excited state for a specific element.
3. Measuring the amount of the light absorbed by the atoms as they move to the excited state (the atomic absorption).
4. Using the measured absorbance to calculate the concentration of the element in a solution, based on a calibration graph.

Materials

• Spectrometer
• Radiation sources
• Atomizers
• Atomic absorption
• Spectrophotometer

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