Poly( 2vinylpyridine) or poly(4-vinylpyridine) coated on a piezoelectric quartz crystal adsorbed copper, thus decreasing the oscillation frequency. The bound copper could be removed by EDTA solution. Poly( 4-vinylpyridine) is recommended to determine copper (5-35 MM) in a maleate buffer at pH 6.6 fl
Frequency properties of a piezoelectric quartz crystal in solutions and application to total salt determination
β Scribed by Yao Shou-Zhuo; Mo Zhi-Hong
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 497 KB
- Volume
- 193
- Category
- Article
- ISSN
- 0003-2670
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π SIMILAR VOLUMES
At 1.5 V applied between the electrodes on the piezoelectric crystal, many metals electrodeposit on an electrode so that the frequency changes. Iron(II1) (1 X lo-'-1 x 1O-4 M) can be determined by adsorption of iron(II1) phosphate which also causes a frequency change. Electrodeposition can be preven
## Abstract In this work, we present two methods to determine the contact point in forceβdistance curves obtained with the atomic force microscope. These procedures are compared with the typical determination of contact point by a visual assessment of the data. One method, based on the assumption t