Abstract
The paper presents the development, validation, and evaluation of measurement uncertainty of a method for quantitative determination of essential and nonessential elements in medicinal plants and their aqueous extracts by using inductively coupled plasma optical emission spectrometry. The detailed validation of the analytical procedure and calculation of the measurement uncertainty budget allowed the recognition of the methods' critical points. The obtained limit of quantification, repeatability, and measurement uncertainty were satisfactory. The trueness of the method was verified by recovery estimation using certified reference materials. The recovery rates of all metals were between 95% and 105%. The paper presents for the first time all the steps needed to evaluate the measurement uncertainty and validate the determination method of selected elements in medicinal plants and their aqueous extracts. In summary, the obtained results demonstrate that the method can be applied effectively for the designed purpose.
Highlights
The paper presents the development, validation, and evaluation of measurement uncertainty of a method for quantitative determination of essential and nonessential elements in medicinal plants and their aqueous extracts by using inductively coupled plasma optical emission spectrometry
Method validation The validation of the analytical procedure for quantitative determination of elements in medicinal plants and their aqueous extracts was performed by evaluating selectivity, working and linear ranges, limit of detection (LoD), limit of quantification (LoQ), trueness, and precision (EURACHEM 1998)
The selectivity in the case of inductively coupled plasma optical emission spectrometry (ICP-OES) method is related to possible interferences of the emission spectrum at specific wavelengths
Summary
The paper presents the development, validation, and evaluation of measurement uncertainty of a method for quantitative determination of essential and nonessential elements in medicinal plants and their aqueous extracts by using inductively coupled plasma optical emission spectrometry. Chamomile is used for its anxiolytic, antiseptic, and anti-inflammatory properties, while milfoil is used for its strong astringent effect and to treat a variety of illnesses and disorders from stomach aches to circulatory disorders. Rattle is usually used to treat digestive and neurological disorders; brotherwort has antiseptic properties and is used for acne and allergies treatment; pot marigold has anti-inflammatory and antitumor properties; linden is used for its calming effects and to ease cold and flu symptoms; while peppermint is used to relieve stomach aches, nausea, fever, stress, and to boost the immune system
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