
Contents
11.1.29
AOAC Official Method 973.53
Potassium in Water: Atomic Absorption Spectrophotometric Method
Get access
-
Published:January 2023
Cite
Potassium in Water: Atomic Absorption Spectrophotometric Method', in Dr. George W Latimer, Jr. (ed.), Official Methods of Analysis of AOAC INTERNATIONAL, 22nd Edition (
Extract
First Action 1973
Principle
Method is applicable to determination of 0.01–2 mg K/L of surface and saline waters and domestic and industrial wastes. Na may interfere if present at much higher levels than K but effect may be avoided by approximate matching Na concentration of standards with that of specimen.
Synthetic water analyzed by 19 analysts in 10 laboratories showed results on exact increments of K salt (see Table 973.53).
Statistical results for water containing exact increments of K salt
...
Apparatus
Atomic absorption spectrophotometer.—Equipped with Boling-type burner, set at 766.5 nm.
Reagents
...
Determination
Follow manufacturer’s instructions for apparatus operation. Optimize conditions for maximum absorption and stability. Beginning with blank and working toward highest standard, aspirate solutions and record readings. Repeat standard solutions and specimens enough times to secure reliable average reading for each solution. If necessary, dilute specimen with H2O to bring into range for direct reading.
For instruments which read directly in concentration, set curve corrector to read out proper concentration. Otherwise, plot calibration curve, using concentration range producing absorption of 0–80%. Before plotting, convert percent absorption to absorbance: A = log (100/% T) = 2 – log % T, where % T = 100 – % absorption. Curves are frequently nonlinear. Increase number of standards in that portion of curve.
Sign in
Personal account
- Sign in with email/username & password
- Get email alerts
- Save searches
- Purchase content
- Activate your purchase/trial code
- Add your ORCID iD
Purchase
Our books are available by subscription or purchase to libraries and institutions.
Purchasing informationMonth: | Total Views: |
---|---|
March 2024 | 3 |
April 2024 | 3 |
May 2024 | 2 |
July 2024 | 7 |
September 2024 | 3 |
October 2024 | 5 |
November 2024 | 1 |
December 2024 | 6 |
January 2025 | 5 |
February 2025 | 6 |
March 2025 | 4 |
Get help with access
Institutional access
Access to content on Oxford Academic is often provided through institutional subscriptions and purchases. If you are a member of an institution with an active account, you may be able to access content in one of the following ways:
IP based access
Typically, access is provided across an institutional network to a range of IP addresses. This authentication occurs automatically, and it is not possible to sign out of an IP authenticated account.
Sign in through your institution
Choose this option to get remote access when outside your institution. Shibboleth/Open Athens technology is used to provide single sign-on between your institution’s website and Oxford Academic.
If your institution is not listed or you cannot sign in to your institution’s website, please contact your librarian or administrator.
Sign in with a library card
Enter your library card number to sign in. If you cannot sign in, please contact your librarian.
Society Members
Society member access to a journal is achieved in one of the following ways:
Sign in through society site
Many societies offer single sign-on between the society website and Oxford Academic. If you see ‘Sign in through society site’ in the sign in pane within a journal:
If you do not have a society account or have forgotten your username or password, please contact your society.
Sign in using a personal account
Some societies use Oxford Academic personal accounts to provide access to their members. See below.
Personal account
A personal account can be used to get email alerts, save searches, purchase content, and activate subscriptions.
Some societies use Oxford Academic personal accounts to provide access to their members.
Viewing your signed in accounts
Click the account icon in the top right to:
Signed in but can't access content
Oxford Academic is home to a wide variety of products. The institutional subscription may not cover the content that you are trying to access. If you believe you should have access to that content, please contact your librarian.
Institutional account management
For librarians and administrators, your personal account also provides access to institutional account management. Here you will find options to view and activate subscriptions, manage institutional settings and access options, access usage statistics, and more.