What is the correction in hydrometer reading?

What is the correction in hydrometer reading?

Explanation: Both meniscus and dispersing agent correction are applied to a hydrometer reading. Explanation: The actual reading to be taken at water level will be more; hence the meniscus correction will be always positive.

What factors must be corrected for in the hydrometer analysis?

Before the percent of soil remaining in suspension can be calculated, the hydrometer reading must be corrected for the following factors: a. The specific gravity of the dispersing agent and the distilled water – The formulas for the percent of soil remaining in suspension are based on the use of distilled water.

What are the corrections applied in hydrometer analysis of fine grained soil?

The correction factor, Cd, is determined by adding to a 1000-ml graduate partially filled with distilled or demineralized water the amount of dispersing agent to be used for the particular test, adding additional distilled water to the 1000-ml mark, then inserting a hydrometer and observing the reading.

What are the three types of correction needed for the hydrometer analysis?

(i) Meniscus correction. (ii) Temperature correction. (iii) Density correction. (iv) Dispersing agent correction.

Why do we need to treat the soil sample with h2o2?

Hydrogen peroxide (30%) is used to remove the organic carbon/matter from soils having its higher content and is also used in pipette method for estimation of organic carbon.

What is the purpose of dispersing the soil in the hydrometer method of soil texture determination?

Dispersant solution (e.g. sodium hexametaphosphate) is added to 40 g of soil and the soil is mechanically stirred on a shaker. Dispersant solution separates all the clay particles and breaks apart the soil aggregates.

Why h2o2 is added into soil before performing hydrometer analysis?

In sedimentation analysis, the soil under testing is firstly boiled with little distilled water to wet and break up the particles. After that, hydrogen peroxide is added to remove any organic material.

What is heavy and light soil?

Soil texture (such as loam, sandy loam or clay) refers to the proportion of sand, silt and clay sized particles that make up the mineral fraction of the soil. For example, light soil refers to a soil high in sand relative to clay, while heavy soils are made up largely of clay.

What is a soil hydrometer?

The hydrometer instrument is a buoyant glass tube calibrated to measure the relative density of liquids. There are two types of soil hydrometers for use in soil suspensions. The 152h hydrometer measures the grams per liter of the suspension with a capacity of up to 55g of dry soil in the 1,000ml liquid solution.

How do you use a hydrometer in soil analysis?

The Hydrometer Analysis of Soil The hydrometer analysis of soil, based on Stokes’ law, calculates the size of soil particles from the speed at which they settle out of suspension from a liquid. Results from the test show the grain size distribution for soils finer than the No. 200 (75µm) sieve.

How do you read the percent finer on a hydrometer?

The percent finer is read directly from the hydrometer when the particle density is 2.65 g/cm3 and fluid density is 1.00 g/ cm3 (see Table 1 for water density and viscosity at different temperatures). These conditions, however, are rarely met and corrections must be made for deviation from the standard conditions.

How do you write a report on a hydrometer?

Your report should include the following: Analysis of the test results – Complete the table provided and show one sample calculation. Draw the grain size distribution curve for the data from the hydrometer analysis only and the combined grain-size distribution curve.

How to take Hydrometer readings in suspension?

Take readings of the hydrometer in suspension at elapsed times of 1, 2, 4, 15, 30, 60, 240, and 1440 minutes. Additional readings are optional to define particle size distribution. It is possible to perform hydrometer readings on multiple samples at the correct elapsed times by using sequential or staggered mixing and start times. 4.