Name: atomic emission spectroscopy for element analysis
Uploaded: 2024-12-05T18:32:15.000Z
Duration: 1 min 20 s
Channel: JoVE

K12 Standards

Pennsylvania State Academic Standards

9-12

Earth and Space Science

Space Systems

3.3.9-12.C

Atomic Emission Spectroscopy: Overview

Atomik emisyon spektroskopisi veya AES, tüm analitlerin elektrik deşarjı, alev veya plazma ile aynı anda uyarılabildiği bir numunede çok elementli analize izin verir.
AES'de, uyarılmış durum atomları karakteristik emisyonlar vermek için gevşer ve emisyon yoğunluğu, uyarılmış durum popülasyonu ile doğru orantılıdır.
Uyarılmış durum atomlarının önemli popülasyonları, yüksek sıcaklıkta argon plazması kullanılarak elde edilir.
Argon iyonları ve elektronların sıcak, elektriksel olarak iletken gaz halinde bir karışımı olan argon plazması, akan bir argon akışının iyonize edilmesiyle üretilir. Plazma, daha fazla iyonizasyon için en uygun sıcaklığı koruyan bir güç kaynağı ile süresiz olarak sürdürülür. 
Endüktif olarak eşleştirilmiş plazma veya ICP adı verilen radyo frekansı tabanlı bir plazma kaynağı, 10.000 K'ye kadar sıcaklıklara ulaşabilir. AES'de yaygın olarak kullanılan bir uyarma kaynağıdır ve yaygın olarak ICP-AES veya ICP-OES olarak adlandırılır.
Diğer plazma kaynakları arasında mikrodalga kaynaklı plazma, doğru akım plazması, mikroplazmalar ve lazer kaynaklı plazma bulunur.

atomik emisyon spektroskopisi: genel bakış

Atomik emisyon spektroskopisi (AES), uyarılmış atomlardan yayılan ışığı analiz ederek bir örneğin elementel bileşimini belirlemek için kullanılan analitik bir tekniktir. AES'te, bir örnekteki atomlar, plazma, arklar veya kıvılcımlar gibi yüksek sıcaklık kaynaklarından gelen ısıl enerjiyle daha yüksek enerji seviyelerine uyarılır. Bu uyarılmış atomlar daha düşük enerji durumlarına geri döndüğünde, her elementin kendine özgü dalga boylarında ışık yayarlar. Elde edilen atomik emisyon spektrumu, bu dalga boylarına karşılık gelen ayrık hatlardan oluşur ve örnekteki çeşitli elementlerin tanımlanıp nicelendirilebilmesini sağlar.

AES cihazı, atomik absorbsiyon spektrometreleriyle benzerlikler taşır, ancak emisyon tespiti için özel uyarlamalar yapılmıştır. Yüksek sıcaklık kaynakları, özellikle indüktif olarak koplanmış plazma (ICP), AES'te atomları emisyon durumlarına uyarmak için yeterli enerji sağladıkları için çok önemlidir. Diğer plazma kaynakları arasında mikrodalga ile indüklenen plazma (MIP) ve doğru akım plazması (DCP) bulunur. En yaygın kullanılan kaynak olan ICP, 10.000 K'ye kadar sıcaklıklara ulaşarak, tutarlı bir uyarılma ve emisyon için stabil bir ortam oluşturur. ICP-AES, aynı zamanda ICP-OES (optik emisyon spektrometrisi) olarak da bilinir, birden fazla dedektörü emisyon kaynağının etrafında yarım dairesel bir düzenle yerleştirerek, çeşitli dalga boyları üzerinde eş zamanlı ölçümler yapılmasına olanak tanır ve bu sayede çok elementli analiz yapılmasını sağlar.

AES, alev ve elektrotermik teknikler gibi geleneksel atomik absorbsiyon yöntemlerine göre birkaç avantaj sunar. Yüksek sıcaklık kaynaklarının kompleks molekülleri parçalayabilmesi nedeniyle, AES kimyasal girişimlere karşı daha az duyarlıdır ve bu da daha temiz spektral ölçümler yapılmasını sağlar. Bu teknik, aynı anda çoklu element analizi yapabilme imkanı sunarak analitik verimliliği önemli ölçüde artırır. Ayrıca, AES daha geniş bir konsantrasyon aralığını kapsar, bu da onu çeşitli örnek tipleri için uygun hale getirir.

Bu avantajlara rağmen, AES'in bazı sınırlamaları vardır. Yüksek sıcaklık kaynakları tarafından üretilen karmaşık spektrumlar, spektral girişimlerin olasılığını artırarak nicel analizleri zorlaştırır. Bu zorluklarla başa çıkmak için, AES cihazları, genellikle atomik absorbsiyon spektrometrisinde kullanılanlardan daha pahalı olan yüksek çözünürlüklü optik sistemler gerektirir. Dahası, AES çoklu element analizi için güçlü bir yöntem olmasına rağmen, atomik absorbsiyon teknikleri, basitliği, maliyet etkinliği ve hassasiyeti nedeniyle tek element analizinde hala değerli bir yöntem olarak kalmaktadır.

AES, metalleri, iz elementler ve diğer inorganik maddeleri analiz etmek için çevresel izleme, malzeme bilimi ve klinik laboratuvarlarda yaygın olarak kullanılmaktadır. Hızlı ve çoklu element analizi yapabilme yeteneği, AES'i özellikle toprak, su ve biyolojik örneklerin test edilmesi için faydalı hale getirir. AES cihazlarının yüksek hassasiyeti ve geniş elementel aralığı, iz seviyelerindeki ve yüksek konsantrasyonlardaki doğru ölçümler yapılmasına olanak tanır, bu da onu çeşitli bilimsel alanlarda elementel analiz için çok yönlü bir araç yapar.

AES'de kantitatif analiz, yayılan ışığın yoğunluğunu ölçmeye dayanır; bu yoğunluk, uyarılmış atomların popülasyonu ile doğru orantılıdır. Boltzmann dağılımına göre, bu uyarılmış durum popülasyonu, uyarılma kaynağının sıcaklığına bağlıdır ve daha yüksek sıcaklıklar daha büyük emisyonlara yol açar. Kalibrasyon eğrileri, genellikle birkaç büyüklük sırası boyunca doğrusal olup, emisyon yoğunluklarını elementel konsantrasyonlarla ilişkilendirmek için bilinen standartlar analiz edilerek oluşturulur. Standardizasyon teknikleri, uyarılma verimliliğindeki ve diğer cihazsal faktörlerdeki değişimlerin kontrol altına alınması için çok önemlidir ve bu, çeşitli örneklerdeki elementlerin doğru bir şekilde nicelendirilmesini sağlar.

Atomik Emisyon Spektroskopisi: Genel Bakış

Atomik emisyon spektroskopisi (AES), yayılan ışığı analiz ederek bir numunenin temel bileşimini belirlemek için kullanılan analitik bir tekniktir.

Education

JoVE Core

Analytical Chemistry

Analitik Kimya

Unit 1

Ünite 1

Atomic Spectroscopy

Atomik Spektroskopi

KEY TERMS AND CONCEPTS

TEMEL TERİMLER VE KAVRAMLAR

atomic emission spectroscopy for element analysis

Atomic emission spectroscopy is used to identify the elements in a sample by measuring the light they emit. Atoms are first excited to higher energy levels by thermal energy from hot sources such as plasma, arcs, or sparks. When they fall back to lower energy levels, they give off light at specific wavelengths. Each element produces its own set of lines, so the emission spectrum can show both what is present and how much is there.

AES instruments are similar to atomic absorption spectrometers, but they are built to detect emitted light. High-temperature sources are essential because they provide enough energy to excite atoms into their emission states. Inductively coupled plasma, or ICP, is the most widely used source. It can reach temperatures up to 10,000 K and creates a stable environment for steady excitation and emission. Other plasma sources used in AES include microwave-induced plasma, or MIP, and direct current plasma, or DCP.

ICP-AES is also called ICP-OES, which stands for optical emission spectrometry. This setup allows multielement analysis by placing multiple detectors in a semicircular array around the emission source. The detectors can record several wavelengths at the same time. That makes the method fast and useful when more than one element must be measured in the same sample.

AES has several advantages over traditional atomic absorption methods such as flame and electrothermal techniques. The high-temperature source helps break apart complex molecules, so chemical interferences are usually lower. The method also supports simultaneous multielement analysis, which improves efficiency. In addition, AES covers a wider concentration range, so it works with many different sample types.

The technique also has limits. High-temperature sources create complex spectra, which increases the chance of spectral interferences and can make quantitative analysis harder. AES instruments need high-resolution optical systems to separate the lines clearly, and these systems are often more expensive than those used in atomic absorption spectrometry. For single-element analysis, atomic absorption methods are still useful because they are simple, cost-effective, and precise.

AES is widely used in environmental monitoring, materials science, and clinical laboratories. It can analyze metals, trace elements, and other inorganic substances in soil, water, and biological samples. This makes it valuable for rapid testing across many scientific fields. The method is sensitive and can measure both trace and significant concentrations.

Quantitative AES depends on the intensity of the emitted light. That intensity is related to the number of atoms in the excited state. According to the Boltzmann distribution, this excited-state population depends on the temperature of the source, so higher temperatures produce more emission. To find concentration, scientists use calibration curves made from known standards, and they apply standardization methods to reduce the effects of changes in excitation efficiency and other instrument factors.

Atomic Emission Spectroscopy for Element Analysis

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atomic spectroscopy: absorption, emission, and fluorescence

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Element Analysis with Atomic Light Spectra

Atomic spectroscopy is used to identify and measure elements by their light signals. It supports both qualitative analysis, which tells what is present, and quantitative analysis, which tells how much is present. The optical methods in this group are atomic absorption spectroscopy, atomic emission spectroscopy, and atomic fluorescence spectroscopy. These methods begin with atomization. In this step, a solid, liquid, or solution sample is changed into gas-phase atoms and ions. Once the sample...

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How Heat Changes Atomic Spectra

Heat changes atomic spectra by affecting atomization, excitation, ionization, and line shape. In atomic spectroscopy, atomization means converting a sample into gas-phase atoms and ions. The flame temperature needed for this step changes how efficiently the method works and shifts the balance between excited and ground-state atoms. At thermal equilibrium, the relative numbers of excited and ground-state atoms can be estimated with the Maxwell-Boltzmann distribution. A small temperature rise...

atomic absorption spectroscopy: overview

Atomic Absorption Spectroscopy for Trace Metals

Atomic absorption spectroscopy (AAS) measures trace metals by tracking how atoms absorb electromagnetic radiation (EMR). The absorbed light makes atoms move to a higher-energy orbit. In AAS, the key step is atomization, which converts the sample into gas-phase atoms. A flame or a furnace is typically used for this step. Inside the flame, some atoms become thermally excited. Most stay in the ground state, which is the lowest-energy state. These ground-state gas-phase atoms absorb EMR only when...

atomic absorption spectroscopy: instrumentation

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Atomic Absorption Spectroscopy: Key Parts

Atomic absorption spectrophotometry uses a set of key parts to measure light absorbed by atoms. The main components are a radiation source, an atomizer, a monochromator, and a detector. Each part has a specific job in the instrument. The radiation source is usually a hollow-cathode lamp, or HCL, or an electrodeless-discharge lamp, or EDL. Both produce a narrow emission line at the needed wavelength. Some instruments instead use continuum sources with high-resolution monochromators to narrow...

atomic absorption spectroscopy: radiation and light sources

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Choosing Light Sources for AAS Measurements

Atomic absorption spectroscopy (AAS) uses a light source that emits a very narrow range of wavelengths. This is needed because the source must match the absorption behavior of the analyte atom. The choice of source also depends on giving a precise, intense emission at the right wavelength for accurate detection. Two common line sources in AAS are hollow-cathode lamps (HCLs) and electrodeless-discharge lamps (EDLs). These lamps are selected based on the element being analyzed and the level of...

atomic absorption spectroscopy: atomization methods

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Atomic Absorption Spectroscopy: Sample Atomization

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atomic absorption spectroscopy: interference

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Correcting Errors in Atomic Absorption Spectroscopy

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AAS Sample Prep and Calibration

Atomic absorption spectroscopy (AAS) depends on careful sample preparation and calibration. Samples must be turned into clear solutions before measurement. That often means extra treatment to dissolve materials such as soils, animal tissues, and minerals. Common sample prep methods include hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, and fusion with reagents. These steps help make the sample suitable for AAS analysis. Solutions that contain organic...

atomic emission spectroscopy: overview

Atomic emission spectroscopy is used to identify the elements in a sample by measuring the light they emit. Atoms are first excited to higher energy levels by thermal energy from hot sources such as plasma, arcs, or sparks. When they fall back to lower energy levels, they give off light at specific wavelengths. Each element produces its own set of lines, so the emission spectrum can show both what is present and how much is there. AES instruments are similar to atomic absorption spectrometers,...

atomic emission spectroscopy: instrumentation

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AES Sample Handling and Detection

Atomic emission spectrometry (AES) uses sample handling, atomization, and detection parts to measure emitted light from atoms and ions. The sample must first be changed into a gas-phase form so it can produce a measurable signal. AES uses two main atomizer types. Continuous atomizers, such as flames and plasmas, feed the sample in a steady stream. Discrete atomizers add one sample at a time with syringes or autosamplers. The electrothermal atomizer is the most common discrete type. Many...

atomic emission spectroscopy: interference

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Reducing Interference in AES Signals

Atomic emission spectroscopy (AES) can produce interfering signals when atoms and molecules in a flame or plasma emit overlapping light. High-temperature atomizers excite many species at once, including oxides, hydroxides, and flame combustion products. These extra emissions can make the analyte signal harder to read. Spectral interference happens when emission lines or bands overlap. One way to reduce it is to improve instrument resolution. Another is to choose a different emission line for...

inductively coupled plasma atomic emission spectroscopy: principle

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ICP-AES Torch and Sample Analysis

Inductively coupled plasma atomic emission spectroscopy uses a plasma torch to analyze elements in a sample. This method is also called inductively coupled plasma optical emission spectroscopy, or ICP-OES. It is widely used because the plasma creates a strong environment for elemental analysis. The ICP source, or torch, contains three concentric quartz tubes. Argon gas flows through the tubes. A spark from a Tesla coil starts the ionization of argon and creates a high-temperature plasma. The...

inductively coupled plasma atomic emission spectroscopy: instrumentation

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ICP-AES Instrument Types and Detection

Inductively coupled plasma atomic emission spectroscopy, or ICP-AES, uses an inductively coupled plasma to detect and analyze elements in a sample. The method measures the light given off by atoms, which helps identify and compare different elements. It is a common approach in atomic emission spectroscopy. ICP-AES instruments are built in three main forms: sequential, simultaneous multichannel, and Fourier transform instruments. Fourier transform designs are less commonly used, but they are...

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Plasma Sources in Atomic Emission Spectroscopy

Atomic emission spectroscopy uses plasma sources to identify elements by their light. The method creates abundant spectra with characteristic emission lines. Inductively coupled plasma, or ICP, is especially useful because it gives strong quantitative data. It works well under stable conditions, with low noise, low background, and few interferences. Newer air-operated microwave sources are also being studied. These sources may be more cost-effective than conventional ICP systems. Atomic...

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Flame Emission Spectrometry Basics

Flame emission spectrometry uses a flame to excite elements in a sample so their light can be measured. It is also called flame photometry. The method can be used for both qualitative and quantitative analysis of elements. The idea became established in the early 1860s when Kirchhoff and Bunsen showed that specific elements give off characteristic radiation in a flame. The first instrument for this purpose measured sodium in plant ash with a Bunsen flame. A major problem was how to add the...

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Flame photometry is a method for detecting metals by measuring the light they emit in a flame. A solution such as potassium chloride is aspirated into the flame. The solvent evaporates first. The remaining salt becomes dehydrated and then dissociates into free gaseous atoms in the ground state. Some of these atoms absorb energy from the flame and move to an excited state. When they return to the ground state, they emit photons at characteristic wavelengths. These emissions are very narrow...

key terms and concepts

Learn how atomic emission spectroscopy uses emitted light to identify elements, compare ICP-AES and ICP-OES, and measure samples with calibration curves.

Atomic Emission Spectroscopy for Element Analysis | JoVE K12

JoVE Core Analitik Kimya, karmaşık kimyasal prensiplerini anlaşılır, ilgi çekici animasyonlara dönüştürerek basitleştirir ve SI Birimlerinden NMR spektroskopisine kadar konuları daha erişilebilir ve anlaşılır hale getirir. Buna ek olarak, bilim insanlarının yer aldığı videolar, bu kavramların dünya çapındaki laboratuvarlarda yürütülen gerçek dünya araştırmalarındaki uygulamalarını gösterir.

analytical chemistry

Louisiana Student Standards for Science

High School

Earth Science

Earth’s Place In The Universe

HS-ESS1-2

Chemistry

motion-and-stability-forces-and-interactions

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HS-PS2-6

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South Carolina College and Career Ready Science Standards

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Waves and Their Applications in Technologies for Information Transfer

C-PS4-4

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3.3.9-12.D

Atomic Emission Spectroscopy for Element Analysis

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