Analysis was carried out by uplc amino acid analyzer. The result obtained is in the above mentioned question, but in the research paper it is expressed as residue per 1000.
Total Dissolved Solids (TDS) are the total amount of mobile charged ions, including minerals, salts or metals dissolved in a given volume of water, expressed in units of mg per unit volume of water (mg/L), also referred to as parts per million (ppm).
Parts per Million (ppm) is the weight-to-weight ratio of any ion to water.