the strontium ion concentration is about 0.6 to 12 ppm vs the strontium ion concentration is about 12 ppm

The two phrases are not directly comparable as they convey different information. The first phrase provides a range of concentrations (0.6 to 12 ppm) while the second phrase specifies a single concentration (12 ppm). Depending on the context and the level of precision required, either of the phrases could be correct.

Last updated: March 31, 2024 • 282 views

This phrase is correct and commonly used in scientific contexts to indicate a range of concentrations.

"the strontium ion concentration is about 0.6 to 12 ppm"

This phrase is used when referring to a range of values for the concentration of a specific ion in a solution. It provides a lower and upper limit for the concentration.

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R&D in total in the economy, publicly funded, is about 0.6 percent of GDP.
Ion concentration, density and temperature profiles are consistent.
That percentage, by the way, is about the same in the U.S. and Germany and France. R&D in total in the economy, publicly funded, is about 0.6 percent of GDP.
Fluoride ion concentrations are influenced by the duration of anaesthesia and the concentration of sevoflurane.
Others do not give a satisfactory separation of certain amino acids if the hydrolysate contains excess formic acid and/or high sodium ion concentrations.
the hydrogen ion concentration (pH);
Atosiban is found in only small quantities in urine, its urinary concentration is about 50 times lower than that of M1.
Adjustment of the calcium ion concentration to the required level to precipitate para-casein;
Over the projection horizon, growth in real GDP is expected to continue to expand at quarterly rates of about 0.6%.
Maximum observed plasma concentrations were reached within 0.5 to 2 hours (median 1 hour) in the fasted state and absolute bioavailability was about 0.6%.
This will also lead to lower proportions of unemployed people and thus the unemployment benefit spending will fall about 0.6 percentage points of GDP in 2050.
BRENNAN: The strontium isotope results verify Massachusetts. SWEETS:
I was trying anything to get an idea of the mystery man, so I analyzed the strontium isotope composition of his teeth.
These solutions should contain 10 % v/v of the strontium chloride solution (4.4).
The hydrogen ion concentration (actually referred to as pH value) in an aqueous solution generates a potential difference at a measuring electrode (pH-sensitive glass diaphragm) with respect to a reference electrode (Ag/AgCl).
For hydrogen ion concentration the specified performance characteristics are that the method of analysis used must be capable of measuring concentrations equal to the parametric value with a trueness of 0,2 pH unit and a precision of 0,2 pH unit.
The test vessels should be aerated continuously such as to ensure that the dissolved O2 does not fall below 2,5 mg/litre and that, immediately before the measurement of the respiration rate, the O2 concentration is about 6,5 mg/litre.
10 ppm or more but not more than 12 ppm of Denatonium Benzoate (Bitrex),
Fever of greater than 39.5 ºC per dose was observed in 0.6 to 2.8% of infants receiving Prevenar and hexavalent vaccines (see section 4.4).
Following intravenous infusion, the apparent steady-state volume of distribution was 0.6 to 0.8 l/ kg in healthy subjects.

This phrase is correct and commonly used when referring to a specific concentration of an ion in a solution.

"the strontium ion concentration is about 12 ppm"

This phrase is used to specify a single concentration value for the strontium ion in a solution. It does not provide a range of values.

Show examples from the web [+]

Their rate is about 12 percent.
We have a new puppy. He is about 12 weeks old.
Ion concentration, density and temperature profiles are consistent.
Let's just take one country in Africa, Senegal. Their rate is about 12 percent.
Fluoride ion concentrations are influenced by the duration of anaesthesia and the concentration of sevoflurane.
Others do not give a satisfactory separation of certain amino acids if the hydrolysate contains excess formic acid and/or high sodium ion concentrations.
the hydrogen ion concentration (pH);
Atosiban is found in only small quantities in urine, its urinary concentration is about 50 times lower than that of M1.
On the right hand side, that bit there is part of an installation that is about 12 feet long.
Adjustment of the calcium ion concentration to the required level to precipitate para-casein;
Its plasma clearance is about 12 ml/ min (CV 22%) and its renal clearance about 7 ml/ min (CV 28%).
BRENNAN: The strontium isotope results verify Massachusetts. SWEETS:
I was trying anything to get an idea of the mystery man, so I analyzed the strontium isotope composition of his teeth.
These solutions should contain 10 % v/v of the strontium chloride solution (4.4).
The hydrogen ion concentration (actually referred to as pH value) in an aqueous solution generates a potential difference at a measuring electrode (pH-sensitive glass diaphragm) with respect to a reference electrode (Ag/AgCl).
For hydrogen ion concentration the specified performance characteristics are that the method of analysis used must be capable of measuring concentrations equal to the parametric value with a trueness of 0,2 pH unit and a precision of 0,2 pH unit.
The test vessels should be aerated continuously such as to ensure that the dissolved O2 does not fall below 2,5 mg/litre and that, immediately before the measurement of the respiration rate, the O2 concentration is about 6,5 mg/litre.
10 ppm or more but not more than 12 ppm of Denatonium Benzoate (Bitrex),
During transfer an amount of "old" culture is transferred with sterile pipettes into a flask of fresh medium, so that with the fast-growing species the initial concentration is about 100 times smaller than in the old culture.
Only the total element concentration is determined.

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the strontium ion concentration is about 0.6 to 12 ppm vs the strontium ion concentration is about 12 ppm