Essay On Chemical Monitoring And Management

Submitted By Yoseobie0502C
Words: 2638
Pages: 11
Open Document
Year 12 Chemistry
ASSESSMENT TASK 3
Chemical Monitoring and Management INTRODUCTION

Component:
This task incorporates the 3 assessment components.

Knowledge and understanding of: the practice of chemistry, applications and uses of chemistry and their implications for society and the environment, and current issues, research and development in chemistry bonding, energy, chemical reactions, carbon chemistry and stoichiometry

Skills in: planning and conducting first-hand investigations gathering and processing relevant information from secondary sources

Skills in: communicating information and understanding developing scientific thinking and problem-solving techniques

Task:
This task assesses knowledge and understanding and skills associated with Core 3: Chemical Monitoring and Management.

This task relates to the following outcomes:
H3, H4, H8, H9, H11, H14

This task will be marked out of 25.

You have 60 minutes to complete this task.

Part of this task involves analysis of stimulus material provided to students. The stimulus material should be brought to class on the date of the assessment task and used during the assessment task. The material may be annotated by the student in preparation for the task. No other notes, texts or other material may be used during the assessment task.

Stimulus Material

Reading 1

Atomic absorption spectroscopy (AAS)
Summarised from: http://en.wikipedia.org/wiki/Atomic_absorption_spectroscopy
Atomic absorption spectroscopy (AAS) is a spectroanalytical procedure for the quantitative determination of chemical elements, employing the absorption of optical radiation (light) by free atoms in the gaseous state.
In analytical chemistry the technique is used for determining the concentration of a particular element (the analyte) in a sample to be analysed. AAS can be used to determine over 70 different elements in solution or directly in solid samples employed in scientific research.
Atomic absorption spectroscopy was first used as an analytical technique, and the underlying principles were established in the second half of the 19th century by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, both professors at the University of Heidelberg, Germany.
The modern form of AAS was largely developed during the 1950s by a team of Australian chemists. They were led by Sir Alan Walsh at the CSIRO (Commonwealth Scientific and Industrial Research Organisation), Division of Chemical Physics, in Melbourne, Australia.

The chief difference between line source LS AAS and continuum source CS AAS
We have to distinguish between line source AAS (LS AAS) and continuum source AAS (CS AAS). In classical LS AAS, as it has been proposed by Alan Walsh, the high spectral resolution required for AAS measurements is provided by the radiation source itself that emits the spectrum of the analyte in the form of lines that are narrower than the absorption lines. The advantage of this technique is that only a medium-resolution monochromator is necessary for measuring AAS; it has the disadvantage that usually a separate lamp is required for each element that has to be determined. In CS AAS, in contrast, a single lamp, emitting a continuum spectrum over the entire spectral range of interest is used for all elements. Obviously, a high-resolution monochromator is required for this technique.
Reading 2

High Resolution Continuum Source Atomic Absorption Spectrometry (HR-CS AAS)
Summarised from: http://www.isas.de/Enhancements-in-HR-CS-AAS.555.0.html
The High Resolution Continuum Source Atomic Absorption Spectrometry (HR-CS AAS) has been developed in Berlin to overcome fundamental limitations of the well-established AAS technique. As a result, two novel instruments have already been introduced into the market.
High-resolution continuum source atomic absorption spectrometry (HR-CS AAS) is probably the most innovative technique in the field of atomic
Show More

Related Documents: Essay On Chemical Monitoring And Management

Lesser Depression Essay

fiscal drags, let alone spurring faster growth rates than those experienced since mid-2009. Closing the output gap entirely through expansionary fiscal policy would likely require roughly $650 billion of deficit-financed fiscal stimulus in 2013, as well as substantial stimulus in 2014 and 2015 to avoid recurring “fiscal cliffs” in those years. All in all, we estimate policymakers truly committed to a full and durable recovery would need to target roughly $1.5 trillion to $2.2 trillion in additional…

Words 1537 - Pages 7

Essay about Media Violence

involuntarily and unconsciously.” Fault stems from the deficiencies originated from the person or environment. Intention is the most important element which distinguishes fraud from fault. Moreover, the person committing fraud has an objective of moral or material gain. Debugging frauds, which are heavily committed on documents, from faults and bringing them to light is a difficult but not impossible task. Experienced auditors could detect frauds, thanks to their knowledge and experience. Fraudsters definitely…

Words 9629 - Pages 39

Managing Information Technology (7th Edition) Essay

should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. To obtain permission(s) to use material from this work, please submit a written request to Pearson Education, Inc., Permissions Department, One Lake Street, Upper Saddle River,…

Words 239873 - Pages 960