CHEMICAL

EFFECT OF pH ON THE PERFORMANCE OF ION SELECTIVE ELECTRODE H2PO4
- USING MEMBRANE PVC BERPENDUKUNG
WITH ALIQUAT 336

abstract

Effect of ph to ion selective electrode’s h2po4  performance using pvc-supported membrane with  aliquat 366. Research about Effect Of pH to Ion Selective Electrode’s H2PO4  Performance Using PVC-Supported Membrane With Aliquat 366 has been performed. Membrane composition which were used : PVC(0,85 g), Aliquad 336(0,07 g), DOP (0,58 g) dan THF (1 ml ) The result indicated that on pH range of 3 – 6 Nerstian slope obtained : 19 – 62,5 mV per decade. The best condition was on pH 3 with Nernstian Slope 62,5 mV per decade for ISE-H2PO4 - . ISE- H2PO4- Performance was determined by membrane composition factor, pH, age of electrode, and selectivity coefficient.

Keywords : pH, ISE Performance, Aliquad 336, H2PO4-

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PHYSICS

 DISPERSION ANALYSIS Rayleigh waves
GEOLOGICAL STRUCTURE BELOW THE SURFACE
CASE STUDY: REGIONAL WHITE SAND DALEGAN GRESIK

ABSTRACT

Seismic studies have been conducted to identify the structure of the bedding down the earth's surface by using one type of non-invasive method tests the Spectral Analysis of Surface Wave (SASW) through the analysis of Rayleigh wave dispersion. Rayleigh wave dispersion properties can be used to determine the structure of the earth based bedding shear wave velocity (Vs) against depth (h). Retrieval of data in this study are located in White Sand Dalegan Gresik regency by using forward and reverse shooting shooting
near offset offset of 5 meters and 38 meters far. From the results of data processing wave dispersion analysis Rayleigh on each path through the process of inversion of values ​​obtained with the SASW method shear wave velocity (Vs) as a function of the depth of 103 m / s - 1763 m / s on a trajectory pertaman, 108 m / s - 1761 m / s for both the track and 103 m / s - 1761 m / s for the third track. So that from the shear wave velocity values ​​are indicated at a depth of 0-5 meters structure pelapisannya form of dry sand and saturated sand, the depth of 5-10 meters of sand are not consolidated, the depth of 10-20 meters of porous sand and at a depth of 20 -55 meters porous clay and sandstone. 

Keywords: Dispersion curves, Rayleigh waves, SASW method, the shear wave speed
  
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