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Increasing Focus on Drinking Water Safety Sparks Concerns Over Mineral Water

Pub Date：2023-09-01

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View Num：3048

In recent years, the safety of drinking water has become a widespread concern, leading many individuals to turn to mineral water as a preferred choice due to its rich content of various beneficial trace elements, copper is one such element that has garnered attention due to its potential benefits in preventing conditions like osteoporosis and anemia. However, with the continuous growth of industrial manufacturing, the presence of contaminants such as lead, chromium, and arsenic in water resources has gradually increased. As a result, mineral water, being a special type of drinking water, necessitates simultaneous attention to both pollutant elements and beneficial elements.

At present, the main detection techniques for heavy metal indicators in water mainly include chemical methods (such as chromogenic methods) and instrumental methods (such as atomic absorption, ICP-AES, ICP-MS, etc.). Chemical methods require many reagents, are difficult to operate and not friendly to environment. Compared with general atomic absorption instruments ICP-MS has the advantages of lower detection limit and can once simultaneously detect multiple elements. Below we will use our self-developed SUPEC-7000 ICP-MS to conduct elemental determination on 4 types of commercially available mineral water.

Sample handling

Mineral water samples were stabilized with nitric acid and filtered through a 0.45 μm water system filter head for measurement on the machine. Special mineral elements such as Li, Sr, K, Na, Ca, Mg, etc. need to be diluted to an appropriate multiple before being tested on the machine.

Results and discussion

In sample analysis, 4 different brands of mineral water can be tested directly on the machine according to the sample processing method, which can provide high enough stability and tolerance. All lens voltages were optimized using the instrument's autotune function.

Sample determination results and recovery

Four kinds of mineral water were selected for detection using SUPEC-7000 ICP-MS. Each sample was measured three times, and the average value of the measured values was calculated. Meanwhile, spiked sample were measured. The average value of the three results, and calculate the spike recovery rate, whose average value is between 90%-105.4%:

Elements	Mineral water A(mgL）		Mineral water B(mgL）		Mineral water C (mg/L)		Mineral water D(mg/L)		Mineral water A	Mineral water B
Elements	Section out range	Average value	Section out range	Average value	Section out range	Average value	Section out range	Average value	Spike recovery Rate%	Spike recovery Rate%
LI	*	-	*	-	*	-	*	-	98.9	103
Na	6.5	6.3	5月15日	7.7	3.0-5.0	3.3	5.5-19.5	9.22	102	98.8
Mg	26	26.3	2.0-9.0	4.25	0.7-1.5	1.03	6.6-22.9	10.26	97.4	95
SI	7	6.75	> 17.9	26.4	8.97-17.95	17.1	8.97-17.9	17.6	99	102
K	1	1.08	1.0-6.0	2.37	1.0-2.0	1.31	1.5-6.5	3.24	95.8	100
Ca	80	80.6	2.0-10	5.26	5.0-8.0	6.03	8.5-25.6	14.4	101	95.1
Sr	0.2642	0.279	*	-	*	-	*	-	94.2	93.7
Cr	£0.05	0.0003	£0.05	0.0008	0.05	0.0011	0.05	0.0012	95	97.5
Mn	≤0.4	-	0.4	0.002	≤0.4	0.0019	≤0.4	0.0019	94.4	107
Ni	<0.02	0.0002	<0.02	0.0003	<0.02	0.0001	≤0.02	0.0001	102	100
Cu	≤1.0	-	≤1.0	0.0017 ≤	1.0	0.0015	1.0	0.0017	99	97.7
Zn	Boundary indicators	-	Boundary indicators	-	Boundary indicators	-	Boundary indicators	-	100	102
As	<0.01	0.0004	≤0.01	0.0007	0.01	0.0008	≤0.01	0.0008	92.4	103
Cd	≤0.003	-	<0.003	0.0003	£0.003	0.0003	£0.003	0.0003	97	98.3
Sb	≤0.005	0.0023	≤0.005	0.0006	£0.005	0.0006	£0.005	0.0006	98.8	102
Ba	≤0.7	0.115	≤0.7	0.0037	≤0.7	0.054	<0.7	0.0017	103	94.7
Pb	≤0.01	-	≤0.01	0.0004	≤0.01	0.0004	≤0.01	0.0004	100	98.2
Se	Boundary indicators	-	Boundary indicators	-	Boundary indicators	-	Boundary indicators	-	95.5	95.3
Hg	≤0.001	-	≤0.001	-	50.001	-	0.001	-	99.8	100
Sn	-	-	-	0.0005	-	0.0005	-	0.0005	92.7	104

Test precision inspection

In order to examine the precision of the system in detecting high and low concentrations, mineral water samples were continuously injected and analyzed 7 times to test the precision of the system. The peak response RSD values of all elements are within 3%:

Conclusion

In the test of mineral water, SUPEC 7000 ICP-MS is able to simultaneously measure 20 metal elements. It is easy to operate, has high sensitivity, precision and accuracy, and can meet the requirements of rapid determination of metal elements in different matrix mineral waters. At the same time, meeting the standard of "GB 8538 National Food Safety Standard-Examination Method for Drinking Natural Mineral Water".

As the demand for safe and healthy drinking water continues to grow, the industry must adapt and evolve to ensure that mineral water meets the highest standards. FPI emphasizes that we will affirm our ongoing efforts to innovate advanced technologies that contribute to a sustainable and secure future.

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