The Role of Soya Oil Ester in Water-Based PCM for Low Temperature Cool Energy Storage

Table 2

Typical composition of local mineral and tap water.

Number	Parameter	Unit	Test results		Methods of analysis
			Mineral water	Tap water
	Physical
1	Odour	—	Odourless	Odourless	Organoleptic
2	Taste	—	Tasteless	Tasteless	Organoleptic
3	Colour	Scala TCU	0	<3	Calorimetric
4	Turbinity	Scala NTU	0.01	0.26	Turbidimetric
5	Total dissolved solid	mg/L	163	306	Conductometric
6	Temperature	°C	27°C	27°C	Thermometer
	Chemical
1	Mercury (Hg)	mg/L	0.00	<0.01	AAS/spectrophotometric
2	Aluminium (Al)	mg/L	<0.01	—	Alizarin
3	Arsenic (As)	mg/L	0.00	<0.01	AAS
4	Iron (Fe)	mg/L	≤0.003	0.045	AAS
5	Fluoride (F)	mg/L	≤0.01	0.327	Spectrophotometric
6	Cadmium (Cd)	mg/L	<0.002	<0.003	AAS
7	Total hardness (CaCO3)	mg/L	97	261.516	Titrimetric
8	Chloride (Cl^−)	mg/L	10.23	26.89	Argentometric
9	Chlorine (Cl2)	mg/L	0.01	1.8	Titrimetric
10	Ammonium (NH4)	mg/L	<0.008	0.012	Spectrophotometric (Nessler)
11	Chromium Val-6 (Cr^6+)	mg/L	<0.008	0.008	AAS
12	Manganese (Mn)	mg/L	0.00	<0.001	Calorimetric
13	Nitrate (NO3)	mg/L	0.02	0.094	Spectrophotometric (brucine)
14	Nitrite (NO2)	mg/L	<0.004	0.071	Spectrophotometric (NED)
15	pH	mg/L	7	6.9	pH-meter
16	Selenium	mg/L	0.00	<0.006	AAS
17	Zinc (Zn)	mg/L	≤0.01	0.1037	AAS
18	Cyanide (Cn)	mg/L	<0.001	<0.002	Calorimetric
19	Sulfate (SO4)	mg/L	≤2.93	4.884	Turbidimetric
20	Copper (Cu)	mg/L	≤0.004	<0.0075	AAS
21	Timbal (Pb)	mg/L	0.00	<0.0153	AAS
	Microbiological
1	Escherichia coli	AMP/100 mL	0	0	SNI 06-4158-1996 (MPN)
2	Total coliform	AMP/100 mL	0	<0.18	SNI 06-4158-1996 (MPN)