Hach DR/850 - Table of Contents

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TABLE OF CONTENTS
INTRODUCTION..................................................................................................................... 7
Sample Procedure Explained ....................................................................................................9
SECTION 1 CHEMICAL ANALYSIS INFORMATION...................................................... 13
Abbreviations ......................................................................................................................... 13
Converting Chemical Species ................................................................................................ 14
Hardness Conversion....................................................................................................... 15
Dissolved Oxygen............................................................................................................ 16
Sample Collection, Preservation and Storage.................................................................. 18
Correcting for Volume Additions .................................................................................... 22
Boiling Aids..................................................................................................................... 23
Sample Filtration ............................................................................................................. 23
Temperature Considerations............................................................................................ 25
Sample Dilution Techniques............................................................................................ 25
Using Pipets and Graduated Cylinders............................................................................ 26
Using the TenSette Pipet.................................................................................................. 28
Mixing Water Samples .................................................................................................... 29
Using Sample Cells.......................................................................................................... 31
Using AccuVac Ampuls................................................................................................... 32
Using Reagent Powder Pillows ....................................................................................... 33
Using PermaChem Pillows.............................................................................................. 33
Reagent and Standard Stability........................................................................................ 34
Interferences........................................................................................................................... 34
pH Interference................................................................................................................ 35
Accuracy and Precision.......................................................................................................... 36
Standard Additions .......................................................................................................... 36
Method Performance.............................................................................................................. 43
Estimated Detection Limit............................................................................................... 43
Precision .......................................................................................................................... 46
Reagent Blank Correction...................................................................................................... 47
Standard Adjust (Adjusting the Standard Curve)................................................................... 47
Preparing a User-Entered Calibration Curve................................................................... 49
USEPA Approved and Accepted Definitions......................................................................... 51
SECTION 2 SAMPLE PRETREATMENT............................................................................ 53
Digestion ................................................................................................................................ 53
EPA Mild Digestion with Hot Plate for Metals Analysis Only....................................... 53
EPA Vigorous Digestion with Hot Plate for Metals Analysis Only ................................ 54
General Digesdahl Digestion (Not USEPA accepted)..................................................... 55