Does high TDS make you worry about water quality?

Does high TDS make you worry about water quality? greentest eco 6 This article will introduce the relationship between TDS and water quality, so that you have a deeper understanding of water quality.

What is TDS testing?

Total dissolved solids, including dissolved bicarbonate, radioactive detection chloride, sulfate, calcium, magnesium, sodium and potassium; Volatile and non-volatile solids. Its concentration can affect the palatability of drinking water.

The measurement method is the residual weight of the water sample after filtration (0.45μm), and the residual weight of the filtrate after drying at 103 ° C ~ 105 ° C, which is used to see the purity of the water, the unit is ppm, mg/L (mg/L), and the value indicates how much of the water in 1 liter passes the total dissolved solids in mg. Including soluble salts (calcium ions, magnesium ions, etc.), radiation detectors for sale ionic organic matter (ammonium acetate, sodium sulfate, etc.), some enterprises heavy metal ions (chromium, zinc, lead, copper, etc.); The smaller the value, the purer the water and the less impurities, and the larger the value, the more impurities in your water. The level of TDS measurement value is usually related to the environmental background of the water source, which can not fully represent the quality of the water quality, nor can it show that the substance content is high, the substance content is low, and can not reflect the concentration of harmful substances in the water, but only represents the safe geological dissolution of the drinking water source. For example, mineral water or groundwater systems often have high TDS measurements.

How to judge the quality of water?

To judge the quality of potable water, you can start from the following aspects:

Appearance:

Observe the color, turbidity, and smell of the water. If the color of the water is cloudy and has an odor, it may indicate that the water quality is poor.

pH value:

The pH value of water is an indicator to measure the pH value of water, in general, the pH value of healthy drinking water should be about 7, too low or too high may have adverse effects on human health.

Dissolved Solids (TDS):

TDS is a measure of the content of solid substances in water, and a high TDS value may also mean that the water mainly contains too much minerals, salts or other substances, which will affect the quality of drinking water.

Microorganisms in water:

The water may contain a variety of bacteria, viruses and other microorganisms, especially in heavily polluted areas or environments, should be regularly tested for microbial content in the water.

The quality of water depends on many aspects, such as water hardness, purity, pH, etc. TDS detection is only one aspect, so the quality of water can not be judged by TDS value alone.

What are the water quality standards in Taiwan?

According to the latest revision of the "Drinking Water Quality Standards" issued by the Environmental Protection Department of the Executive Yuan on January 10, 2016, there are as many as 68 control items, which can be summarized as follows:

(1) Bacterial criteria:

It includes two items, E. coli group and total colony number.

(2) Physical criteria:

Including turbidity, chroma, odor and other 3 items.

(3) Chemical standards:

A total of 63 indicators can be divided into:

1. Substances that affect health: such as arsenic, lead, cadmium, mercury and other heavy metals, pesticides, total trihalomethane and volatile organic compounds.

2.5 Substances that may affect health, such as fluoride, nitrate nitrogen, silver, etc.

3.12 items, such as iron, manganese, copper, zinc, aluminum, ammonia nitrogen, total hardness, total solid solubility, etc.

4. Free available residual chlorine.

5.Hydrogen ion concentration index.

Limit of total dissolved solids for drinking water quality standards

Generally, water with TDS below 600 mg per litre has a better taste, and it is usually higher than 1200 mg per litre before it is unacceptable to consumers. China's drinking water quality standards set a limit of 500 mg per liter, most of the TDS of tap water is about 65 mg per liter on average, a few use the water source of Shuangxi or Yangming Mountain and other highlands, because of rich minerals, so TDS is higher than the general level, there are 100 mg per liter or more enterprises or even up to 200 mg per liter of tissue