I'm not sure why there are so many negative reviews of this book. I found it to be very solid when I used the 3rd edition.
For those of you who don't like it you have 4 options:
1. "Instrumental Methods of Analysis" by Willard, Merritt, Dean, Settle; (ISBN 0534081428) which is excellent and a true classic. It's OOP now but a new edition comes out in 2016.
2. "Chemical Analysis: Modern Instrumentation Methods and Techniques" by Francis Rouessac & Annick Rouessac
3. "Undergraduate Instrumental Analysis" Sixth Edition by James W. Robinson, Eileen M. Skelly Frame, George M. Frame II
4. "Chemical Instrumentation: A Systematic Approach" by Strobel and Heineman. This book is very hardware oriented and is not a true general instrumental analysis text.
I'd also recommend that you buy "Statistics and Chemometrics for Analytical Chemistry" by James N. Miller & Jane C. Miller. It does a much better job than the cursory chapters found in regular analytical texts. Get the 4th or 5th edition. For a paperback, this book is ridiculously expensive if you buy new. Try to find a used copy.
While the book by Miller & Miller is good, it's no substitute for a 1 or 2 semester course in stats. A good book for this material might be Statistics for Research, Third Edition by Shirley Dowdy, Stanley Wearden, Daniel Chilko (ISBN 047126735X)
Check out my other reviews for other undergrad. chem books.
I notice one of the co-authors (Crouch) has added his comments. He says "This book remains the leader in the field." - not difficult when there are so few competitors!