1 GPG = 17.1 PPM
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To convert parts per million (ppm) of a substance to grains per gallon (gpg), you need to know the atomic or molecular weight of the substance. Once you have this information, you can use the formula: gpg = ppm x (atomic/molecular weight/7000).
To convert 0.06% selenium to ppm, you need to multiply by 10,000. Therefore, 0.06% selenium is equivalent to 600 ppm. To convert 600 ppm to 90 ppm, you would need to dilute the solution by a factor of 6.67 (600 ppm / 90 ppm).
The hardness limit of water is typically referred to as the maximum amount of dissolved minerals, such as calcium and magnesium, that can be present in water before it is considered hard. This limit is often expressed in terms of grains per gallon (gpg) or parts per million (ppm), with water classified as hard if it exceeds around 7 gpg or 120 ppm of hardness minerals.
To convert 0.5 percent to parts per million (ppm), you multiply by 10,000. So, 0.5 percent is equal to 5,000 ppm.
To convert parts per billion (ppb) to parts per million (ppm), you divide by 1000. So, 28 ppb is equal to 0.028 ppm.
In order to convert ppm to pH, one must first understand that 1 ppm is equivalent to 1mg/L. For example, if one wanted to convert 20mg/L into a pH one would use the equation 0.02g/36.45g/mole which is equal to a pH of 3.2.