Web21 mei 2013 · Among toxic ions, sodium (Na +) has the most adverse effects on plant growth by its detrimental influence on plant metabolism in inhibiting enzyme activities. An optimal potassium (K + ) : Na + ratio is vital to activate enzymatic reactions in the cytoplasm necessary for maintenance of plant growth and yield development. Web21 feb. 2024 · Since the beginning of investigations of the Na,K-ATPase, it has been well-known that Mg 2+ is an essential cofactor for activation of enzymatic ATP hydrolysis without being transported through the cell membrane. Moreover, experimental evidence has been collected through the years that shows that Mg 2+ ions have a regulatory effect on ion …
Determination of Potassium, Sodium, and Total Alkalies in Portland …
WebRelease of potassium and nitrate ions from polycarboxylate-cement blocks containing 5% KNO3, with different exposure in extragent aqua redestillata was studied. Using flame photometry we found increased concentration of eliminated potassium ions into the extragent after the 24th hour (0.90 +/- 0.03 … Web3 okt. 2024 · Citric acid (0.48–0.96 kg/m 3) was used by Askarian et al. [10] to retard the setting of the HAC system with 30–60 % OPC. Kadhim et al. [17] investigated the effects of citric salts on the physical properties of OPC. They found that the addition of citric salts (e.g. sodium citrate, potassium citrate, lithium citrate) at a low dosage (<0.1 wt% of OPC) … in and out review
Monitoring of Ion Mobility in the Cement Matrix to Establish ...
Web1 okt. 2024 · It was found that the 28-day compressive strength of the HAC could be improved from 38.5 up to 72.4 MPa by adding 1 wt.% sodium or potassium citrate to the mixture. Microstructure... WebRelease of potassium and nitrate ions from polycarboxylate-cement blocks containing 5% KNO3, with different exposure in extragent aqua redestillata was studied. Using flame … A simple flow injection with flame photometric detection has been developed for determination of sodium, potassium, and total alkalies in portland cement, fly ash, admixtures, and water of concrete. A liquid sample or a digest of solid sample was injected into a water carrier stream which flowed to a flame … Meer weergeven Concrete is the most widely used construction material in the world. It is composed of cement and other cementitious materials such as fly ash and slag cement, … Meer weergeven Analytical reagent grade chemicals were used and deionized water (obtained from a system of Milli-Q, Millipore, Sweden) was used … Meer weergeven FI-FES method was developed and successfully applied for determination of sodium and potassium in cement and materials of … Meer weergeven FI-FES system as shown in Figure 1 was used with the preliminary conditions as follows: flow rate of the carrier stream of 2.0 mL min−1, sample volume of 200 μL, and no mixing coil connected between an injection valve … Meer weergeven dva pink headphones